25621459 has 2 divisors, whose sum is σ = 25621460. Its totient is φ = 25621458.

The previous prime is 25621457. The next prime is 25621487. The reversal of 25621459 is 95412652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25621459 - 2¹ = 25621457 is a prime.

It is a super-2 number, since 2×25621459² = 1312918322577362, which contains 22 as substring.

Together with 25621457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25621457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810729 + 12810730.

It is an arithmetic number, because the mean of its divisors is an integer number (12810730).

Almost surely, 2^25621459 is an apocalyptic number.

25621459 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621459 is an equidigital number, since it uses as much as digits as its factorization.

25621459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 25621459 is about 5061.7644156954. The cubic root of 25621459 is about 294.8048465089.

The spelling of 25621459 in words is "twenty-five million, six hundred twenty-one thousand, four hundred fifty-nine".