1312220031 has 16 divisors (see below), whose sum is σ = 1758931200. Its totient is φ = 870174848.

The previous prime is 1312220029. The next prime is 1312220053. The reversal of 1312220031 is 1300222131.

It is a cyclic number.

It is not a de Polignac number, because 1312220031 - 2¹ = 1312220029 is a prime.

It is a super-2 number, since 2×1312220031² = 3443842819515281922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312240031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501655 + ... + 504263.

It is an arithmetic number, because the mean of its divisors is an integer number (109933200).

Almost surely, 2^1312220031 is an apocalyptic number.

1312220031 is a deficient number, since it is larger than the sum of its proper divisors (446711169).

1312220031 is a wasteful number, since it uses less digits than its factorization.

1312220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1312220031 is about 36224.5777201060. The cubic root of 1312220031 is about 1094.8019299379.

Adding to 1312220031 its reverse (1300222131), we get a palindrome (2612442162).

It can be divided in two parts, 13122 and 20031, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 1312220031 in words is "one billion, three hundred twelve million, two hundred twenty thousand, thirty-one".