31388948144 has 40 divisors (see below), whose sum is σ = 61380833280. Its totient is φ = 15549081408.

The previous prime is 31388948137. The next prime is 31388948161. The reversal of 31388948144 is 44184988313.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1491197 + ... + 1512099.

It is an arithmetic number, because the mean of its divisors is an integer number (1534520832).

Almost surely, 2^31388948144 is an apocalyptic number.

It is an amenable number.

31388948144 is a deficient number, since it is larger than the sum of its proper divisors (29991885136).

31388948144 is a wasteful number, since it uses less digits than its factorization.

31388948144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21777 (or 21771 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 53.

The spelling of 31388948144 in words is "thirty-one billion, three hundred eighty-eight million, nine hundred forty-eight thousand, one hundred forty-four".