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31084117 = 106129297
BaseRepresentation
bin111011010010…
…0111001010101
32011111020101121
41312210321111
530424142432
63030123541
7525132151
oct166447125
964436347
1031084117
1116600a59
12a4b05b1
13659458c
1441b2061
152ae0197
hex1da4e55

31084117 has 4 divisors (see below), whose sum is σ = 31114476. Its totient is φ = 31053760.

The previous prime is 31084099. The next prime is 31084127. The reversal of 31084117 is 71148013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71148013 = 415917107.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 9979281 = 4594^2 + 3159^2 .

It is a cyclic number.

It is not a de Polignac number, because 31084117 - 27 = 31083989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31084091 and 31084100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31084127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13588 + ... + 15709.

It is an arithmetic number, because the mean of its divisors is an integer number (7778619).

Almost surely, 231084117 is an apocalyptic number.

It is an amenable number.

31084117 is a deficient number, since it is larger than the sum of its proper divisors (30359).

31084117 is a wasteful number, since it uses less digits than its factorization.

31084117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30358.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 31084117 is about 5575.3131750602. The cubic root of 31084117 is about 314.4219414456.

It can be divided in two parts, 3108 and 4117, that added together give a square (7225 = 852).

The spelling of 31084117 in words is "thirty-one million, eighty-four thousand, one hundred seventeen".

Divisors: 1 1061 29297 31084117