31213131033443 has 32 divisors (see below), whose sum is σ = 34598048120064. Its totient is φ = 28031455475712.

The previous prime is 31213131033377. The next prime is 31213131033479. The reversal of 31213131033443 is 34433013131213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31213131033443 - 2²⁶ = 31213063924579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213131030443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76037021 + ... + 76446417.

It is an arithmetic number, because the mean of its divisors is an integer number (1081189003752).

Almost surely, 2^{31213131033443} is an apocalyptic number.

31213131033443 is a deficient number, since it is larger than the sum of its proper divisors (3384917086621).

31213131033443 is a wasteful number, since it uses less digits than its factorization.

31213131033443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411791.

The product of its (nonzero) digits is 23328, while the sum is 32.

Adding to 31213131033443 its reverse (34433013131213), we get a palindrome (65646144164656).

The spelling of 31213131033443 in words is "thirty-one trillion, two hundred thirteen billion, one hundred thirty-one million, thirty-three thousand, four hundred forty-three".