31371644989 has 8 divisors (see below), whose sum is σ = 32234118488. Its totient is φ = 30509939520.

The previous prime is 31371644981. The next prime is 31371645017. The reversal of 31371644989 is 98944617313.

It can be written as a sum of positive squares in 4 ways, for example, as 21987848089 + 9383796900 = 148283^2 + 96870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31371644989 - 2³ = 31371644981 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 (31371644981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108702 + ... + 273055.

It is an arithmetic number, because the mean of its divisors is an integer number (4029264811).

Almost surely, 2^31371644989 is an apocalyptic number.

It is an amenable number.

31371644989 is a deficient number, since it is larger than the sum of its proper divisors (862473499).

31371644989 is a wasteful number, since it uses less digits than its factorization.

31371644989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384015.

The product of its digits is 3919104, while the sum is 55.

The spelling of 31371644989 in words is "thirty-one billion, three hundred seventy-one million, six hundred forty-four thousand, nine hundred eighty-nine".