25595221 has 2 divisors, whose sum is σ = 25595222. Its totient is φ = 25595220.

The previous prime is 25595189. The next prime is 25595249. The reversal of 25595221 is 12259552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 1240996 = 4935^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 25595221 - 2⁵ = 25595189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25599221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12797610 + 12797611.

It is an arithmetic number, because the mean of its divisors is an integer number (12797611).

Almost surely, 2^25595221 is an apocalyptic number.

It is an amenable number.

25595221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25595221 is an equidigital number, since it uses as much as digits as its factorization.

25595221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 31.

The square root of 25595221 is about 5059.1719678224. The cubic root of 25595221 is about 294.7041791806.

The spelling of 25595221 in words is "twenty-five million, five hundred ninety-five thousand, two hundred twenty-one".