31896517 has 2 divisors, whose sum is σ = 31896518. Its totient is φ = 31896516.

The previous prime is 31896509. The next prime is 31896523. The reversal of 31896517 is 71569813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31708161 + 188356 = 5631^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 31896517 - 2³ = 31896509 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31896517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31896577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15948258 + 15948259.

It is an arithmetic number, because the mean of its divisors is an integer number (15948259).

Almost surely, 2^31896517 is an apocalyptic number.

It is an amenable number.

31896517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31896517 is an equidigital number, since it uses as much as digits as its factorization.

31896517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 31896517 is about 5647.7001513891. The cubic root of 31896517 is about 317.1376136950.

The spelling of 31896517 in words is "thirty-one million, eight hundred ninety-six thousand, five hundred seventeen".