25425209 has 2 divisors, whose sum is σ = 25425210. Its totient is φ = 25425208.

The previous prime is 25425203. The next prime is 25425223. The reversal of 25425209 is 90252452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 73984 = 5035^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 25425209 - 2²⁴ = 8647993 is a prime.

It is equal to p_1590770 and since 25425209 and 1590770 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25425203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712604 + 12712605.

It is an arithmetic number, because the mean of its divisors is an integer number (12712605).

Almost surely, 2^25425209 is an apocalyptic number.

It is an amenable number.

25425209 is a deficient number, since it is larger than the sum of its proper divisors (1).

25425209 is an equidigital number, since it uses as much as digits as its factorization.

25425209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25425209 is about 5042.3416187323. The cubic root of 25425209 is about 294.0502212632.

The spelling of 25425209 in words is "twenty-five million, four hundred twenty-five thousand, two hundred nine".