13991525 has 12 divisors (see below), whose sum is σ = 17415552. Its totient is φ = 11150640.

The previous prime is 13991507. The next prime is 13991533. The reversal of 13991525 is 52519931.

It is not a de Polignac number, because 13991525 - 2²⁰ = 12942949 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 6764 + ... + 8586.

It is an arithmetic number, because the mean of its divisors is an integer number (1451296).

Almost surely, 2^13991525 is an apocalyptic number.

It is an amenable number.

13991525 is a deficient number, since it is larger than the sum of its proper divisors (3424027).

13991525 is a wasteful number, since it uses less digits than its factorization.

13991525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140 (or 2135 counting only the distinct ones).

The product of its digits is 12150, while the sum is 35.

The square root of 13991525 is about 3740.5246958147. The cubic root of 13991525 is about 240.9655833729.

The spelling of 13991525 in words is "thirteen million, nine hundred ninety-one thousand, five hundred twenty-five".