13222531 has 4 divisors (see below), whose sum is σ = 15111472. Its totient is φ = 11333592.

The previous prime is 13222511. The next prime is 13222553. The reversal of 13222531 is 13522231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13222531 - 2¹⁹ = 12698243 is a prime.

It is a super-2 number, since 2×13222531² = 349670652091922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13222499 and 13222508.

It is not an unprimeable number, because it can be changed into a prime (13222501) 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, 944460 + ... + 944473.

It is an arithmetic number, because the mean of its divisors is an integer number (3777868).

Almost surely, 2^13222531 is an apocalyptic number.

13222531 is a deficient number, since it is larger than the sum of its proper divisors (1888941).

13222531 is an equidigital number, since it uses as much as digits as its factorization.

13222531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888940.

The product of its digits is 360, while the sum is 19.

The square root of 13222531 is about 3636.2798297161. The cubic root of 13222531 is about 236.4675388672.

Adding to 13222531 its reverse (13522231), we get a palindrome (26744762).

The spelling of 13222531 in words is "thirteen million, two hundred twenty-two thousand, five hundred thirty-one".