25621787 has 2 divisors, whose sum is σ = 25621788. Its totient is φ = 25621786.

The previous prime is 25621763. The next prime is 25621801. The reversal of 25621787 is 78712652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25621787 - 2²⁴ = 8844571 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25621787.

It is not a weakly prime, because it can be changed into another prime (25621727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810893 + 12810894.

It is an arithmetic number, because the mean of its divisors is an integer number (12810894).

Almost surely, 2^25621787 is an apocalyptic number.

25621787 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621787 is an equidigital number, since it uses as much as digits as its factorization.

25621787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 25621787 is about 5061.7968153611. The cubic root of 25621787 is about 294.8061045114.

The spelling of 25621787 in words is "twenty-five million, six hundred twenty-one thousand, seven hundred eighty-seven".