31797993143 has 16 divisors (see below), whose sum is σ = 37941989376. Its totient is φ = 26055691200.

The previous prime is 31797993137. The next prime is 31797993151. The reversal of 31797993143 is 34139979713.

It is a happy number.

It is not a de Polignac number, because 31797993143 - 2¹⁶ = 31797927607 is a prime.

It is a super-2 number, since 2×31797993143² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31797993193) 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, 235130 + ... + 344792.

It is an arithmetic number, because the mean of its divisors is an integer number (2371374336).

Almost surely, 2^31797993143 is an apocalyptic number.

31797993143 is a deficient number, since it is larger than the sum of its proper divisors (6143996233).

31797993143 is a wasteful number, since it uses less digits than its factorization.

31797993143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111494.

The product of its digits is 3857868, while the sum is 56.

The spelling of 31797993143 in words is "thirty-one billion, seven hundred ninety-seven million, nine hundred ninety-three thousand, one hundred forty-three".