31982889891 has 16 divisors (see below), whose sum is σ = 44043398784. Its totient is φ = 20631422784.

The previous prime is 31982889877. The next prime is 31982889901. The reversal of 31982889891 is 19898828913.

It is not a de Polignac number, because 31982889891 - 2²³ = 31974501283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31982889391) 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, 1144746 + ... + 1172351.

It is an arithmetic number, because the mean of its divisors is an integer number (2752712424).

Almost surely, 2^31982889891 is an apocalyptic number.

31982889891 is a deficient number, since it is larger than the sum of its proper divisors (12060508893).

31982889891 is a wasteful number, since it uses less digits than its factorization.

31982889891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317250.

The product of its digits is 17915904, while the sum is 66.

The spelling of 31982889891 in words is "thirty-one billion, nine hundred eighty-two million, eight hundred eighty-nine thousand, eight hundred ninety-one".