13643531 has 8 divisors (see below), whose sum is σ = 15531264. Its totient is φ = 11863720.

The previous prime is 13643527. The next prime is 13643533. The reversal of 13643531 is 13534631.

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

It is not a de Polignac number, because 13643531 - 2² = 13643527 is a prime.

It is a super-2 number, since 2×13643531² = 372291876295922, 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 13643531.

It is not an unprimeable number, because it can be changed into a prime (13643533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26711 + ... + 27216.

It is an arithmetic number, because the mean of its divisors is an integer number (1941408).

Almost surely, 2^13643531 is an apocalyptic number.

13643531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13643531 is a deficient number, since it is larger than the sum of its proper divisors (1887733).

13643531 is a wasteful number, since it uses less digits than its factorization.

13643531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53961.

The product of its digits is 3240, while the sum is 26.

The square root of 13643531 is about 3693.7150675167. The cubic root of 13643531 is about 238.9510412487.

Subtracting from 13643531 its reverse (13534631), we obtain a square (108900 = 330²).

The spelling of 13643531 in words is "thirteen million, six hundred forty-three thousand, five hundred thirty-one".