25937981 has 2 divisors, whose sum is σ = 25937982. Its totient is φ = 25937980.

The previous prime is 25937969. The next prime is 25938001. The reversal of 25937981 is 18973952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 586756 = 5035^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 25937981 - 2²² = 21743677 is a prime.

It is a super-2 number, since 2×25937981² = 1345557716712722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25937941) 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, 12968990 + 12968991.

It is an arithmetic number, because the mean of its divisors is an integer number (12968991).

Almost surely, 2^25937981 is an apocalyptic number.

It is an amenable number.

25937981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25937981 is an equidigital number, since it uses as much as digits as its factorization.

25937981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 25937981 is about 5092.9344193696. The cubic root of 25937981 is about 296.0138666805.

The spelling of 25937981 in words is "twenty-five million, nine hundred thirty-seven thousand, nine hundred eighty-one".