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3117818681 = 29661162649
BaseRepresentation
bin1011100111010110…
…0010001100111001
322001021201121011222
42321311202030321
522341130144211
61233213401425
7140156010245
oct27165421471
98037647158
103117818681
11135aa2235a
12730199275
133a8c26633
14218115425
15133ab81db
hexb9d62339

3117818681 has 8 divisors (see below), whose sum is σ = 3230229000. Its totient is φ = 3005735040.

The previous prime is 3117818677. The next prime is 3117818731. The reversal of 3117818681 is 1868187113.

It can be written as a sum of positive squares in 4 ways, for example, as 805651456 + 2312167225 = 28384^2 + 48085^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3117818681 - 22 = 3117818677 is a prime.

It is a super-2 number, since 2×31178186812 = 19441586655185159522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3117818611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62156 + ... + 100493.

It is an arithmetic number, because the mean of its divisors is an integer number (403778625).

Almost surely, 23117818681 is an apocalyptic number.

It is an amenable number.

3117818681 is a deficient number, since it is larger than the sum of its proper divisors (112410319).

3117818681 is a wasteful number, since it uses less digits than its factorization.

3117818681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163339.

The product of its digits is 64512, while the sum is 44.

The square root of 3117818681 is about 55837.4308237763. The cubic root of 3117818681 is about 1460.8881005965. Note that the first 3 decimals are identical.

The spelling of 3117818681 in words is "three billion, one hundred seventeen million, eight hundred eighteen thousand, six hundred eighty-one".

Divisors: 1 29 661 19169 162649 4716821 107510989 3117818681