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13311997 = 89373401
BaseRepresentation
bin110010110001…
…111111111101
3221001022121221
4302301333331
511401440442
61153153341
7221102326
oct62617775
927038557
1013311997
117572556
12455b851
1329b122a
141aa744d
15127e467
hexcb1ffd

13311997 has 8 divisors (see below), whose sum is σ = 13531320. Its totient is φ = 13094400.

The previous prime is 13311973. The next prime is 13312001. The reversal of 13311997 is 79911331.

It can be written as a sum of positive squares in 4 ways, for example, as 4137156 + 9174841 = 2034^2 + 3029^2 .

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 13311997 - 211 = 13309949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13311937) 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, 32997 + ... + 33397.

It is an arithmetic number, because the mean of its divisors is an integer number (1691415).

Almost surely, 213311997 is an apocalyptic number.

It is an amenable number.

13311997 is a deficient number, since it is larger than the sum of its proper divisors (219323).

13311997 is an equidigital number, since it uses as much as digits as its factorization.

13311997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

The product of its digits is 5103, while the sum is 34.

The square root of 13311997 is about 3648.5609491963. The cubic root of 13311997 is about 236.9996676691. Note that the first 3 decimals are identical.

The spelling of 13311997 in words is "thirteen million, three hundred eleven thousand, nine hundred ninety-seven".

Divisors: 1 89 373 401 33197 35689 149573 13311997