31431369648 has 80 divisors (see below), whose sum is σ = 93127896576. Its totient is φ = 8948405760.

The previous prime is 31431369643. The next prime is 31431369659. The reversal of 31431369648 is 84696313413.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 31431369597 and 31431369606.

It is not an unprimeable number, because it can be changed into a prime (31431369643) 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 15 ways as a sum of consecutive naturals, for example, 72036 + ... + 260867.

Almost surely, 2^31431369648 is an apocalyptic number.

It is an amenable number.

31431369648 is an abundant number, since it is smaller than the sum of its proper divisors (61696526928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31431369648 is a wasteful number, since it uses less digits than its factorization.

31431369648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333202 (or 333196 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 48.

The spelling of 31431369648 in words is "thirty-one billion, four hundred thirty-one million, three hundred sixty-nine thousand, six hundred forty-eight".