25256381 has 2 divisors, whose sum is σ = 25256382. Its totient is φ = 25256380.

The previous prime is 25256359. The next prime is 25256383. The reversal of 25256381 is 18365252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 912025 = 4934^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 25256381 - 2⁶ = 25256317 is a prime.

It is a super-2 number, since 2×25256381² = 1275769562434322, which contains 22 as substring.

Together with 25256383, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25256383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628190 + 12628191.

It is an arithmetic number, because the mean of its divisors is an integer number (12628191).

Almost surely, 2^25256381 is an apocalyptic number.

It is an amenable number.

25256381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25256381 is an equidigital number, since it uses as much as digits as its factorization.

25256381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 25256381 is about 5025.5727036826. The cubic root of 25256381 is about 293.3979264032.

The spelling of 25256381 in words is "twenty-five million, two hundred fifty-six thousand, three hundred eighty-one".