25165813 has 2 divisors, whose sum is σ = 25165814. Its totient is φ = 25165812.

The previous prime is 25165807. The next prime is 25165843. The reversal of 25165813 is 31856152.

25165813 is nontrivially palindromic in base 4.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18601969 + 6563844 = 4313^2 + 2562^2 .

It is a cyclic number.

It is not a de Polignac number, because 25165813 - 2¹³ = 25157621 is a prime.

It is equal to p_1575661 and since 25165813 and 1575661 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25165843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12582906 + 12582907.

It is an arithmetic number, because the mean of its divisors is an integer number (12582907).

Almost surely, 2^25165813 is an apocalyptic number.

It is an amenable number.

25165813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25165813 is an equidigital number, since it uses as much as digits as its factorization.

25165813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 25165813 is about 5016.5538968499. The cubic root of 25165813 is about 293.0468033967.

The spelling of 25165813 in words is "twenty-five million, one hundred sixty-five thousand, eight hundred thirteen".