1313220431 has 4 divisors (see below), whose sum is σ = 1322668200. Its totient is φ = 1303772664.

The previous prime is 1313220413. The next prime is 1313220449. The reversal of 1313220431 is 1340223131.

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

It is an interprime number because it is at equal distance from previous prime (1313220413) and next prime (1313220449).

It is a cyclic number.

It is not a de Polignac number, because 1313220431 - 2²² = 1309026127 is a prime.

It is a super-2 number, since 2×1313220431² = 3449095800791651522, 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 (1313220451) 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, 4723676 + ... + 4723953.

It is an arithmetic number, because the mean of its divisors is an integer number (330667050).

Almost surely, 2^1313220431 is an apocalyptic number.

1313220431 is a deficient number, since it is larger than the sum of its proper divisors (9447769).

1313220431 is an equidigital number, since it uses as much as digits as its factorization.

1313220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9447768.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1313220431 is about 36238.3833938546. The cubic root of 1313220431 is about 1095.0800747652.

Adding to 1313220431 its reverse (1340223131), we get a palindrome (2653443562).

The spelling of 1313220431 in words is "one billion, three hundred thirteen million, two hundred twenty thousand, four hundred thirty-one".