31231356464443 has 4 divisors (see below), whose sum is σ = 31231514459448. Its totient is φ = 31231198469440.

The previous prime is 31231356464419. The next prime is 31231356464489. The reversal of 31231356464443 is 34446465313213.

It is a happy number.

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-31231356464443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231356864443) 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, 78700621 + ... + 79096462.

It is an arithmetic number, because the mean of its divisors is an integer number (7807878614862).

Almost surely, 2^{31231356464443} is an apocalyptic number.

31231356464443 is a deficient number, since it is larger than the sum of its proper divisors (157995005).

31231356464443 is a wasteful number, since it uses less digits than its factorization.

31231356464443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157995004.

The product of its digits is 7464960, while the sum is 49.

The spelling of 31231356464443 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred fifty-six million, four hundred sixty-four thousand, four hundred forty-three".