31855697 has 2 divisors, whose sum is σ = 31855698. Its totient is φ = 31855696.

The previous prime is 31855679. The next prime is 31855699. The reversal of 31855697 is 79655813.

Together with previous prime (31855679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31854736 + 961 = 5644^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 31855697 - 2⁶ = 31855633 is a prime.

Together with 31855699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31855699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15927848 + 15927849.

It is an arithmetic number, because the mean of its divisors is an integer number (15927849).

Almost surely, 2^31855697 is an apocalyptic number.

It is an amenable number.

31855697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31855697 is an equidigital number, since it uses as much as digits as its factorization.

31855697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 31855697 is about 5644.0851340142. The cubic root of 31855697 is about 317.0022688888.

The spelling of 31855697 in words is "thirty-one million, eight hundred fifty-five thousand, six hundred ninety-seven".