1313220331 has 4 divisors (see below), whose sum is σ = 1331716464. Its totient is φ = 1294724200.

The previous prime is 1313220313. The next prime is 1313220343. The reversal of 1313220331 is 1330223131.

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 1313220331 - 2²⁷ = 1179002603 is a prime.

It is a super-2 number, since 2×1313220331² = 3449095275503499122, 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 = 1313220299 and 1313220308.

It is not an unprimeable number, because it can be changed into a prime (1313220361) 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, 9247960 + ... + 9248101.

It is an arithmetic number, because the mean of its divisors is an integer number (332929116).

Almost surely, 2^1313220331 is an apocalyptic number.

1313220331 is a deficient number, since it is larger than the sum of its proper divisors (18496133).

1313220331 is an equidigital number, since it uses as much as digits as its factorization.

1313220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18496132.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1313220331 is about 36238.3820141021. The cubic root of 1313220331 is about 1095.0800469689.

Adding to 1313220331 its reverse (1330223131), we get a palindrome (2643443462).

The spelling of 1313220331 in words is "one billion, three hundred thirteen million, two hundred twenty thousand, three hundred thirty-one".