25627621 has 2 divisors, whose sum is σ = 25627622. Its totient is φ = 25627620.

The previous prime is 25627597. The next prime is 25627627. The reversal of 25627621 is 12672652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 376996 = 5025^2 + 614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25627621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25627627) 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, 12813810 + 12813811.

It is an arithmetic number, because the mean of its divisors is an integer number (12813811).

Almost surely, 2^25627621 is an apocalyptic number.

It is an amenable number.

25627621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25627621 is an equidigital number, since it uses as much as digits as its factorization.

25627621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 25627621 is about 5062.3730601369. The cubic root of 25627621 is about 294.8284782864.

The spelling of 25627621 in words is "twenty-five million, six hundred twenty-seven thousand, six hundred twenty-one".