13809017925 has 18 divisors (see below), whose sum is σ = 24733485842. Its totient is φ = 7364809440.

The previous prime is 13809017903. The next prime is 13809017933. The reversal of 13809017925 is 52971090831.

It can be written as a sum of positive squares in 3 ways, for example, as 2342463201 + 11466554724 = 48399^2 + 107082^2 .

It is not a de Polignac number, because 13809017925 - 2⁶ = 13809017861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30686482 + ... + 30686931.

Almost surely, 2^13809017925 is an apocalyptic number.

13809017925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13809017925 is a deficient number, since it is larger than the sum of its proper divisors (10924467917).

13809017925 is a wasteful number, since it uses less digits than its factorization.

13809017925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61373429 (or 61373421 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 13809017925 in words is "thirteen billion, eight hundred nine million, seventeen thousand, nine hundred twenty-five".