25620631 has 2 divisors, whose sum is σ = 25620632. Its totient is φ = 25620630.

The previous prime is 25620589. The next prime is 25620641. The reversal of 25620631 is 13602652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25620631 - 2¹³ = 25612439 is a prime.

It is a super-2 number, since 2×25620631² = 1312833465676322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25620596 and 25620605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25620641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810315 + 12810316.

It is an arithmetic number, because the mean of its divisors is an integer number (12810316).

Almost surely, 2^25620631 is an apocalyptic number.

25620631 is a deficient number, since it is larger than the sum of its proper divisors (1).

25620631 is an equidigital number, since it uses as much as digits as its factorization.

25620631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 25620631 is about 5061.6826253727. The cubic root of 25620631 is about 294.8016707719.

The spelling of 25620631 in words is "twenty-five million, six hundred twenty thousand, six hundred thirty-one".