25621087 has 2 divisors, whose sum is σ = 25621088. Its totient is φ = 25621086.

The previous prime is 25621081. The next prime is 25621109. The reversal of 25621087 is 78012652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25621087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25621081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810543 + 12810544.

It is an arithmetic number, because the mean of its divisors is an integer number (12810544).

Almost surely, 2^25621087 is an apocalyptic number.

25621087 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621087 is an equidigital number, since it uses as much as digits as its factorization.

25621087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 25621087 is about 5061.7276694820. The cubic root of 25621087 is about 294.8034197370.

The spelling of 25621087 in words is "twenty-five million, six hundred twenty-one thousand, eighty-seven".