25955621 has 2 divisors, whose sum is σ = 25955622. Its totient is φ = 25955620.

The previous prime is 25955597. The next prime is 25955627. The reversal of 25955621 is 12655952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 5152900 = 4561^2 + 2270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25955621 is a prime.

It is a super-2 number, since 2×25955621² = 1347388522991282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25955627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12977810 + 12977811.

It is an arithmetic number, because the mean of its divisors is an integer number (12977811).

Almost surely, 2^25955621 is an apocalyptic number.

It is an amenable number.

25955621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25955621 is an equidigital number, since it uses as much as digits as its factorization.

25955621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 35.

The square root of 25955621 is about 5094.6659360551. The cubic root of 25955621 is about 296.0809562165.

The spelling of 25955621 in words is "twenty-five million, nine hundred fifty-five thousand, six hundred twenty-one".