31131434443 has 4 divisors (see below), whose sum is σ = 31135018600. Its totient is φ = 31127850288.

The previous prime is 31131434423. The next prime is 31131434459. The reversal of 31131434443 is 34443413113.

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-31131434443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131434423) 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, 1779018 + ... + 1796431.

It is an arithmetic number, because the mean of its divisors is an integer number (7783754650).

Almost surely, 2^31131434443 is an apocalyptic number.

31131434443 is a deficient number, since it is larger than the sum of its proper divisors (3584157).

31131434443 is an equidigital number, since it uses as much as digits as its factorization.

31131434443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584156.

The product of its digits is 20736, while the sum is 31.

Adding to 31131434443 its reverse (34443413113), we get a palindrome (65574847556).

The spelling of 31131434443 in words is "thirty-one billion, one hundred thirty-one million, four hundred thirty-four thousand, four hundred forty-three".