1312031091 has 16 divisors (see below), whose sum is σ = 2006726400. Its totient is φ = 746941728.

The previous prime is 1312031087. The next prime is 1312031101. The reversal of 1312031091 is 1901302131.

It is not a de Polignac number, because 1312031091 - 2² = 1312031087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1312031191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110481 + ... + 121778.

It is an arithmetic number, because the mean of its divisors is an integer number (125420400).

Almost surely, 2^1312031091 is an apocalyptic number.

1312031091 is a deficient number, since it is larger than the sum of its proper divisors (694695309).

1312031091 is a wasteful number, since it uses less digits than its factorization.

1312031091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232538.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1312031091 is about 36221.9697283292. The cubic root of 1312031091 is about 1094.7493823975.

The spelling of 1312031091 in words is "one billion, three hundred twelve million, thirty-one thousand, ninety-one".