25971641 has 2 divisors, whose sum is σ = 25971642. Its totient is φ = 25971640.

The previous prime is 25971637. The next prime is 25971661. The reversal of 25971641 is 14617952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 4857616 = 4595^2 + 2204^2 .

It is a cyclic number.

It is not a de Polignac number, because 25971641 - 2² = 25971637 is a prime.

It is a super-2 number, since 2×25971641² = 1349052272465762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25971601) 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, 12985820 + 12985821.

It is an arithmetic number, because the mean of its divisors is an integer number (12985821).

Almost surely, 2^25971641 is an apocalyptic number.

It is an amenable number.

25971641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25971641 is an equidigital number, since it uses as much as digits as its factorization.

25971641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 25971641 is about 5096.2379261569. The cubic root of 25971641 is about 296.1418581358.

The spelling of 25971641 in words is "twenty-five million, nine hundred seventy-one thousand, six hundred forty-one".