13869531 has 12 divisors (see below), whose sum is σ = 21575008. Its totient is φ = 8535024.

The previous prime is 13869523. The next prime is 13869533. The reversal of 13869531 is 13596831.

It is a happy number.

It is not a de Polignac number, because 13869531 - 2³ = 13869523 is a prime.

It is a super-2 number, since 2×13869531² = 384727780319922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13869533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59155 + ... + 59388.

Almost surely, 2^13869531 is an apocalyptic number.

13869531 is a deficient number, since it is larger than the sum of its proper divisors (7705477).

13869531 is a wasteful number, since it uses less digits than its factorization.

13869531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118562 (or 118559 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 13869531 is about 3724.1819235907. The cubic root of 13869531 is about 240.2632008333.

It can be divided in two parts, 13869 and 531, that added together give a square (14400 = 120²).

The spelling of 13869531 in words is "thirteen million, eight hundred sixty-nine thousand, five hundred thirty-one".