25621487 has 2 divisors, whose sum is σ = 25621488. Its totient is φ = 25621486.

The previous prime is 25621459. The next prime is 25621493. The reversal of 25621487 is 78412652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25621487 - 2⁶ = 25621423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25621417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810743 + 12810744.

It is an arithmetic number, because the mean of its divisors is an integer number (12810744).

Almost surely, 2^25621487 is an apocalyptic number.

25621487 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621487 is an equidigital number, since it uses as much as digits as its factorization.

25621487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 25621487 is about 5061.7671815286. The cubic root of 25621487 is about 294.8049538998.

The spelling of 25621487 in words is "twenty-five million, six hundred twenty-one thousand, four hundred eighty-seven".