25558121 has 2 divisors, whose sum is σ = 25558122. Its totient is φ = 25558120.

The previous prime is 25558081. The next prime is 25558139. The reversal of 25558121 is 12185552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 3279721 = 4720^2 + 1811^2 .

It is a cyclic number.

It is not a de Polignac number, because 25558121 - 2²² = 21363817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25558171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779060 + 12779061.

It is an arithmetic number, because the mean of its divisors is an integer number (12779061).

Almost surely, 2^25558121 is an apocalyptic number.

It is an amenable number.

25558121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25558121 is an equidigital number, since it uses as much as digits as its factorization.

25558121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000, while the sum is 29.

The square root of 25558121 is about 5055.5040302625. The cubic root of 25558121 is about 294.5617201387.

The spelling of 25558121 in words is "twenty-five million, five hundred fifty-eight thousand, one hundred twenty-one".