25475621 has 2 divisors, whose sum is σ = 25475622. Its totient is φ = 25475620.

The previous prime is 25475617. The next prime is 25475623. The reversal of 25475621 is 12657452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 84100 = 5039^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 25475621 - 2² = 25475617 is a prime.

Together with 25475623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25475623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12737810 + 12737811.

It is an arithmetic number, because the mean of its divisors is an integer number (12737811).

Almost surely, 2^25475621 is an apocalyptic number.

It is an amenable number.

25475621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25475621 is an equidigital number, since it uses as much as digits as its factorization.

25475621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 25475621 is about 5047.3380112689. The cubic root of 25475621 is about 294.2444362946.

The spelling of 25475621 in words is "twenty-five million, four hundred seventy-five thousand, six hundred twenty-one".