13249531 has 4 divisors (see below), whose sum is σ = 13268200. Its totient is φ = 13230864.

The previous prime is 13249513. The next prime is 13249543. The reversal of 13249531 is 13594231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13594231 = 7 ⋅1942033.

It is a cyclic number.

It is not a de Polignac number, because 13249531 - 2⁵ = 13249499 is a prime.

It is a super-2 number, since 2×13249531² = 351100143439922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13249531.

It is not an unprimeable number, because it can be changed into a prime (13249331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8226 + ... + 9703.

It is an arithmetic number, because the mean of its divisors is an integer number (3317050).

Almost surely, 2^13249531 is an apocalyptic number.

13249531 is a deficient number, since it is larger than the sum of its proper divisors (18669).

13249531 is an equidigital number, since it uses as much as digits as its factorization.

13249531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18668.

The product of its digits is 3240, while the sum is 28.

The square root of 13249531 is about 3639.9905219657. The cubic root of 13249531 is about 236.6283825750.

The spelling of 13249531 in words is "thirteen million, two hundred forty-nine thousand, five hundred thirty-one".