31671879893 has 4 divisors (see below), whose sum is σ = 33338820960. Its totient is φ = 30004938828.

The previous prime is 31671879871. The next prime is 31671879917. The reversal of 31671879893 is 39897817613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39897817613 = 211 ⋅189089183.

It is a cyclic number.

It is not a de Polignac number, because 31671879893 - 2²⁰ = 31670831317 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 (31671879803) 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, 833470505 + ... + 833470542.

It is an arithmetic number, because the mean of its divisors is an integer number (8334705240).

Almost surely, 2^31671879893 is an apocalyptic number.

It is an amenable number.

31671879893 is a deficient number, since it is larger than the sum of its proper divisors (1666941067).

31671879893 is a wasteful number, since it uses less digits than its factorization.

31671879893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666941066.

The product of its digits is 13716864, while the sum is 62.

The spelling of 31671879893 in words is "thirty-one billion, six hundred seventy-one million, eight hundred seventy-nine thousand, eight hundred ninety-three".