13999531 has 8 divisors (see below), whose sum is σ = 17230304. Its totient is φ = 11076480.

The previous prime is 13999529. The next prime is 13999537. The reversal of 13999531 is 13599931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13999531 - 2¹ = 13999529 is a prime.

It is a super-2 number, since 2×13999531² = 391973736439922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13999537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76830 + ... + 77011.

It is an arithmetic number, because the mean of its divisors is an integer number (2153788).

Almost surely, 2^13999531 is an apocalyptic number.

13999531 is a deficient number, since it is larger than the sum of its proper divisors (3230773).

13999531 is a wasteful number, since it uses less digits than its factorization.

13999531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153861.

The product of its digits is 32805, while the sum is 40.

The square root of 13999531 is about 3741.5947134878. The cubic root of 13999531 is about 241.0115350619.

The spelling of 13999531 in words is "thirteen million, nine hundred ninety-nine thousand, five hundred thirty-one".