25164409 has 2 divisors, whose sum is σ = 25164410. Its totient is φ = 25164408.

The previous prime is 25164401. The next prime is 25164427. The reversal of 25164409 is 90446152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23736384 + 1428025 = 4872^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 25164409 - 2³ = 25164401 is a prime.

It is not a weakly prime, because it can be changed into another prime (25164401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12582204 + 12582205.

It is an arithmetic number, because the mean of its divisors is an integer number (12582205).

Almost surely, 2^25164409 is an apocalyptic number.

It is an amenable number.

25164409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25164409 is an equidigital number, since it uses as much as digits as its factorization.

25164409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 25164409 is about 5016.4139581976. The cubic root of 25164409 is about 293.0413536043.

The spelling of 25164409 in words is "twenty-five million, one hundred sixty-four thousand, four hundred nine".