31340973871 has 4 divisors (see below), whose sum is σ = 31342130352. Its totient is φ = 31339817392.

The previous prime is 31340973821. The next prime is 31340973893. The reversal of 31340973871 is 17837904313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31340973871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340973821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536590 + ... + 592123.

It is an arithmetic number, because the mean of its divisors is an integer number (7835532588).

Almost surely, 2^31340973871 is an apocalyptic number.

31340973871 is a deficient number, since it is larger than the sum of its proper divisors (1156481).

31340973871 is a wasteful number, since it uses less digits than its factorization.

31340973871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156480.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 31340973871 in words is "thirty-one billion, three hundred forty million, nine hundred seventy-three thousand, eight hundred seventy-one".