31291543928 has 16 divisors (see below), whose sum is σ = 58699132080. Its totient is φ = 15638442048.

The previous prime is 31291543883. The next prime is 31291543937. The reversal of 31291543928 is 82934519213.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 898076 + ... + 932267.

It is an arithmetic number, because the mean of its divisors is an integer number (3668695755).

Almost surely, 2^31291543928 is an apocalyptic number.

It is an amenable number.

31291543928 is a deficient number, since it is larger than the sum of its proper divisors (27407588152).

31291543928 is a wasteful number, since it uses less digits than its factorization.

31291543928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832486 (or 1832482 counting only the distinct ones).

The product of its digits is 466560, while the sum is 47.

The spelling of 31291543928 in words is "thirty-one billion, two hundred ninety-one million, five hundred forty-three thousand, nine hundred twenty-eight".