1321310031 has 4 divisors (see below), whose sum is σ = 1761746712. Its totient is φ = 880873352.

The previous prime is 1321310009. The next prime is 1321310033. The reversal of 1321310031 is 1300131231.

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 1321310031 - 2⁷ = 1321309903 is a prime.

It is a super-2 number, since 2×1321310031² = 3491720396042441922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321310033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220218336 + ... + 220218341.

It is an arithmetic number, because the mean of its divisors is an integer number (440436678).

Almost surely, 2^1321310031 is an apocalyptic number.

1321310031 is a deficient number, since it is larger than the sum of its proper divisors (440436681).

1321310031 is an equidigital number, since it uses as much as digits as its factorization.

1321310031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440436680.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1321310031 is about 36349.8284865280. The cubic root of 1321310031 is about 1097.3240827553.

Adding to 1321310031 its reverse (1300131231), we get a palindrome (2621441262).

The spelling of 1321310031 in words is "one billion, three hundred twenty-one million, three hundred ten thousand, thirty-one".