25387381 has 2 divisors, whose sum is σ = 25387382. Its totient is φ = 25387380.

The previous prime is 25387367. The next prime is 25387387. The reversal of 25387381 is 18378352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25341156 + 46225 = 5034^2 + 215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25387381 is a prime.

It is a super-2 number, since 2×25387381² = 1289038228078322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25387381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25387387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12693690 + 12693691.

It is an arithmetic number, because the mean of its divisors is an integer number (12693691).

Almost surely, 2^25387381 is an apocalyptic number.

It is an amenable number.

25387381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25387381 is an equidigital number, since it uses as much as digits as its factorization.

25387381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 25387381 is about 5038.5891874611. The cubic root of 25387381 is about 293.9043181319.

The spelling of 25387381 in words is "twenty-five million, three hundred eighty-seven thousand, three hundred eighty-one".