31823432813 has 4 divisors (see below), whose sum is σ = 31832706108. Its totient is φ = 31814159520.

The previous prime is 31823432741. The next prime is 31823432827.

It is a happy number.

31823432813 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10898942404 + 20924490409 = 104398^2 + 144653^2 .

It is a cyclic number.

It is not a de Polignac number, because 31823432813 - 2³⁴ = 14643563629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31823432833) 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, 4631498 + ... + 4638363.

It is an arithmetic number, because the mean of its divisors is an integer number (7958176527).

Almost surely, 2^31823432813 is an apocalyptic number.

It is an amenable number.

31823432813 is a deficient number, since it is larger than the sum of its proper divisors (9273295).

31823432813 is an equidigital number, since it uses as much as digits as its factorization.

31823432813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9273294.

The product of its digits is 82944, while the sum is 38.

The spelling of 31823432813 in words is "thirty-one billion, eight hundred twenty-three million, four hundred thirty-two thousand, eight hundred thirteen".