31143153928 has 16 divisors (see below), whose sum is σ = 58395907260. Its totient is φ = 15570912000.

The previous prime is 31143153907. The next prime is 31143153983. The reversal of 31143153928 is 82935134113.

It can be written as a sum of positive squares in 2 ways, for example, as 25895890084 + 5247263844 = 160922^2 + 72438^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156588 + ... + 294628.

Almost surely, 2^31143153928 is an apocalyptic number.

It is an amenable number.

31143153928 is a deficient number, since it is larger than the sum of its proper divisors (27252753332).

31143153928 is a wasteful number, since it uses less digits than its factorization.

31143153928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166248 (or 166244 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The spelling of 31143153928 in words is "thirty-one billion, one hundred forty-three million, one hundred fifty-three thousand, nine hundred twenty-eight".