25366409 has 2 divisors, whose sum is σ = 25366410. Its totient is φ = 25366408.

The previous prime is 25366399. The next prime is 25366421. The reversal of 25366409 is 90466352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25030009 + 336400 = 5003^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 25366409 - 2²⁴ = 8589193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25366009) 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, 12683204 + 12683205.

It is an arithmetic number, because the mean of its divisors is an integer number (12683205).

Almost surely, 2^25366409 is an apocalyptic number.

It is an amenable number.

25366409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25366409 is an equidigital number, since it uses as much as digits as its factorization.

25366409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 25366409 is about 5036.5076193728. The cubic root of 25366409 is about 293.8233663736.

The spelling of 25366409 in words is "twenty-five million, three hundred sixty-six thousand, four hundred nine".