31786809989 has 6 divisors (see below), whose sum is σ = 34939221030. Its totient is φ = 28897099880.

The previous prime is 31786809983. The next prime is 31786810109. The reversal of 31786809989 is 98990868713.

It can be written as a sum of positive squares in only one way, i.e., 30987617089 + 799192900 = 176033^2 + 28270^2 .

It is not a de Polignac number, because 31786809989 - 2²⁴ = 31770032773 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 (31786809983) 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 5 ways as a sum of consecutive naturals, for example, 131350334 + ... + 131350575.

It is an arithmetic number, because the mean of its divisors is an integer number (5823203505).

Almost surely, 2^31786809989 is an apocalyptic number.

It is an amenable number.

31786809989 is a deficient number, since it is larger than the sum of its proper divisors (3152411041).

31786809989 is a wasteful number, since it uses less digits than its factorization.

31786809989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262700931 (or 262700920 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 68.

The spelling of 31786809989 in words is "thirty-one billion, seven hundred eighty-six million, eight hundred nine thousand, nine hundred eighty-nine".