31891934067 has 16 divisors (see below), whose sum is σ = 50710156800. Its totient is φ = 17431615872.

The previous prime is 31891934033. The next prime is 31891934099. The reversal of 31891934067 is 76043919813.

It is not a de Polignac number, because 31891934067 - 2⁷ = 31891933939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31891932067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33013942 + ... + 33014907.

It is an arithmetic number, because the mean of its divisors is an integer number (3169384800).

Almost surely, 2^31891934067 is an apocalyptic number.

31891934067 is a deficient number, since it is larger than the sum of its proper divisors (18818222733).

31891934067 is a wasteful number, since it uses less digits than its factorization.

31891934067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66028882.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 31891934067 in words is "thirty-one billion, eight hundred ninety-one million, nine hundred thirty-four thousand, sixty-seven".