31245961 has 2 divisors, whose sum is σ = 31245962. Its totient is φ = 31245960.

The previous prime is 31245953. The next prime is 31245967. The reversal of 31245961 is 16954213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 109561 = 5580^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 31245961 - 2³ = 31245953 is a prime.

It is not a weakly prime, because it can be changed into another prime (31245967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622980 + 15622981.

It is an arithmetic number, because the mean of its divisors is an integer number (15622981).

Almost surely, 2^31245961 is an apocalyptic number.

It is an amenable number.

31245961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31245961 is an equidigital number, since it uses as much as digits as its factorization.

31245961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 31245961 is about 5589.8086729333. The cubic root of 31245961 is about 314.9666916994.

The spelling of 31245961 in words is "thirty-one million, two hundred forty-five thousand, nine hundred sixty-one".