31025641 has 2 divisors, whose sum is σ = 31025642. Its totient is φ = 31025640.

The previous prime is 31025627. The next prime is 31025677. The reversal of 31025641 is 14652013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29387241 + 1638400 = 5421^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 31025641 - 2¹⁵ = 30992873 is a prime.

31025641 is a modest number, since divided by 25641 gives 31 as remainder.

It is not a weakly prime, because it can be changed into another prime (31025611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15512820 + 15512821.

It is an arithmetic number, because the mean of its divisors is an integer number (15512821).

Almost surely, 2^31025641 is an apocalyptic number.

It is an amenable number.

31025641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31025641 is an equidigital number, since it uses as much as digits as its factorization.

31025641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 31025641 is about 5570.0665166585. The cubic root of 31025641 is about 314.2246522753.

Adding to 31025641 its reverse (14652013), we get a palindrome (45677654).

The spelling of 31025641 in words is "thirty-one million, twenty-five thousand, six hundred forty-one".