31720343473 has 32 divisors (see below), whose sum is σ = 39276711936. Its totient is φ = 24945979968.

The previous prime is 31720343461. The next prime is 31720343483. The reversal of 31720343473 is 37434302713.

It is a de Polignac number, because none of the positive numbers 2^k-31720343473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31720343453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13090140 + ... + 13092562.

It is an arithmetic number, because the mean of its divisors is an integer number (1227397248).

Almost surely, 2^31720343473 is an apocalyptic number.

It is an amenable number.

31720343473 is a deficient number, since it is larger than the sum of its proper divisors (7556368463).

31720343473 is a wasteful number, since it uses less digits than its factorization.

31720343473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253.

The product of its (nonzero) digits is 127008, while the sum is 37.

The spelling of 31720343473 in words is "thirty-one billion, seven hundred twenty million, three hundred forty-three thousand, four hundred seventy-three".