31260997 has 2 divisors, whose sum is σ = 31260998. Its totient is φ = 31260996.

The previous prime is 31260991. The next prime is 31261001. The reversal of 31260997 is 79906213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17355556 + 13905441 = 4166^2 + 3729^2 .

It is a cyclic number.

It is not a de Polignac number, because 31260997 - 2¹⁹ = 30736709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31260991) 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, 15630498 + 15630499.

It is an arithmetic number, because the mean of its divisors is an integer number (15630499).

Almost surely, 2^31260997 is an apocalyptic number.

It is an amenable number.

31260997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31260997 is an equidigital number, since it uses as much as digits as its factorization.

31260997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 31260997 is about 5591.1534588133. The cubic root of 31260997 is about 315.0172057453.

The spelling of 31260997 in words is "thirty-one million, two hundred sixty thousand, nine hundred ninety-seven".