31120997 has 2 divisors, whose sum is σ = 31120998. Its totient is φ = 31120996.

The previous prime is 31120987. The next prime is 31121021. The reversal of 31120997 is 79902113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 11282881 = 4454^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120997 - 2¹⁸ = 30858853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31120937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560498 + 15560499.

It is an arithmetic number, because the mean of its divisors is an integer number (15560499).

Almost surely, 2^31120997 is an apocalyptic number.

It is an amenable number.

31120997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120997 is an equidigital number, since it uses as much as digits as its factorization.

31120997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 31120997 is about 5578.6196321312. The cubic root of 31120997 is about 314.5462417778.

The spelling of 31120997 in words is "thirty-one million, one hundred twenty thousand, nine hundred ninety-seven".