31918097 has 2 divisors, whose sum is σ = 31918098. Its totient is φ = 31918096.

The previous prime is 31918091. The next prime is 31918111. The reversal of 31918097 is 79081913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29149201 + 2768896 = 5399^2 + 1664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31918097 is a prime.

It is a super-2 number, since 2×31918097² = 2037529832202818, which contains 22 as substring.

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 31918097.

It is not a weakly prime, because it can be changed into another prime (31918091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15959048 + 15959049.

It is an arithmetic number, because the mean of its divisors is an integer number (15959049).

Almost surely, 2^31918097 is an apocalyptic number.

It is an amenable number.

31918097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31918097 is an equidigital number, since it uses as much as digits as its factorization.

31918097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 31918097 is about 5649.6103405456. The cubic root of 31918097 is about 317.2091187526.

The spelling of 31918097 in words is "thirty-one million, nine hundred eighteen thousand, ninety-seven".