31644961 has 2 divisors, whose sum is σ = 31644962. Its totient is φ = 31644960.

The previous prime is 31644931. The next prime is 31644967. The reversal of 31644961 is 16944613.

31644961 is nontrivially palindromic in base 7.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28515600 + 3129361 = 5340^2 + 1769^2 .

It is a cyclic number.

It is not a de Polignac number, because 31644961 - 2¹¹ = 31642913 is a prime.

It is not a weakly prime, because it can be changed into another prime (31644967) 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, 15822480 + 15822481.

It is an arithmetic number, because the mean of its divisors is an integer number (15822481).

Almost surely, 2^31644961 is an apocalyptic number.

It is an amenable number.

31644961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31644961 is an equidigital number, since it uses as much as digits as its factorization.

31644961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 31644961 is about 5625.3854090187. The cubic root of 31644961 is about 316.3016967257.

The spelling of 31644961 in words is "thirty-one million, six hundred forty-four thousand, nine hundred sixty-one".