25981427 has 2 divisors, whose sum is σ = 25981428. Its totient is φ = 25981426.

The previous prime is 25981411. The next prime is 25981429. The reversal of 25981427 is 72418952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25981427 - 2⁴ = 25981411 is a prime.

Together with 25981429, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (25981429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990713 + 12990714.

It is an arithmetic number, because the mean of its divisors is an integer number (12990714).

Almost surely, 2^25981427 is an apocalyptic number.

25981427 is a deficient number, since it is larger than the sum of its proper divisors (1).

25981427 is an equidigital number, since it uses as much as digits as its factorization.

25981427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 25981427 is about 5097.1979557400. The cubic root of 25981427 is about 296.1790484480.

The spelling of 25981427 in words is "twenty-five million, nine hundred eighty-one thousand, four hundred twenty-seven".