25487681 has 2 divisors, whose sum is σ = 25487682. Its totient is φ = 25487680.

The previous prime is 25487639. The next prime is 25487713. The reversal of 25487681 is 18678452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24910081 + 577600 = 4991^2 + 760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25487681 is a prime.

It is a super-2 number, since 2×25487681² = 1299243765515522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25487621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12743840 + 12743841.

It is an arithmetic number, because the mean of its divisors is an integer number (12743841).

Almost surely, 2^25487681 is an apocalyptic number.

It is an amenable number.

25487681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25487681 is an equidigital number, since it uses as much as digits as its factorization.

25487681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 25487681 is about 5048.5325590710. The cubic root of 25487681 is about 294.2908601298.

The spelling of 25487681 in words is "twenty-five million, four hundred eighty-seven thousand, six hundred eighty-one".