13213531 has 8 divisors (see below), whose sum is σ = 14389200. Its totient is φ = 12085920.

The previous prime is 13213507. The next prime is 13213547. The reversal of 13213531 is 13531231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13213531 is a prime.

It is a super-2 number, since 2×13213531² = 349194802975922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13213499 and 13213508.

It is not an unprimeable number, because it can be changed into a prime (13213231) 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, 11440 + ... + 12541.

It is an arithmetic number, because the mean of its divisors is an integer number (1798650).

Almost surely, 2^13213531 is an apocalyptic number.

13213531 is a deficient number, since it is larger than the sum of its proper divisors (1175669).

13213531 is a wasteful number, since it uses less digits than its factorization.

13213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24029.

The product of its digits is 270, while the sum is 19.

The square root of 13213531 is about 3635.0420905404. The cubic root of 13213531 is about 236.4138756441.

Adding to 13213531 its reverse (13531231), we get a palindrome (26744762).

The spelling of 13213531 in words is "thirteen million, two hundred thirteen thousand, five hundred thirty-one".