1931323989 has 64 divisors (see below), whose sum is σ = 3194716160. Its totient is φ = 1013368320.

The previous prime is 1931323943. The next prime is 1931323997. The reversal of 1931323989 is 9893231391.

It is not a de Polignac number, because 1931323989 - 2⁷ = 1931323861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931323939) 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 63 ways as a sum of consecutive naturals, for example, 1776204 + ... + 1777290.

It is an arithmetic number, because the mean of its divisors is an integer number (49917440).

Almost surely, 2^1931323989 is an apocalyptic number.

1931323989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1931323989 is a deficient number, since it is larger than the sum of its proper divisors (1263392171).

1931323989 is a wasteful number, since it uses less digits than its factorization.

1931323989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250.

The product of its digits is 314928, while the sum is 48.

The square root of 1931323989 is about 43946.8313874846. The cubic root of 1931323989 is about 1245.3317049743.

The spelling of 1931323989 in words is "one billion, nine hundred thirty-one million, three hundred twenty-three thousand, nine hundred eighty-nine".