13220431 has 4 divisors (see below), whose sum is σ = 15109072. Its totient is φ = 11331792.

The previous prime is 13220419. The next prime is 13220437. The reversal of 13220431 is 13402231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13402231 = 439 ⋅30529.

It is a cyclic number.

It is not a de Polignac number, because 13220431 - 2²³ = 4831823 is a prime.

It is a super-2 number, since 2×13220431² = 349559591651522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220437) 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, 944310 + ... + 944323.

It is an arithmetic number, because the mean of its divisors is an integer number (3777268).

Almost surely, 2^13220431 is an apocalyptic number.

13220431 is a deficient number, since it is larger than the sum of its proper divisors (1888641).

13220431 is an equidigital number, since it uses as much as digits as its factorization.

13220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888640.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13220431 is about 3635.9910615952. The cubic root of 13220431 is about 236.4550196271.

Adding to 13220431 its reverse (13402231), we get a palindrome (26622662).

The spelling of 13220431 in words is "thirteen million, two hundred twenty thousand, four hundred thirty-one".