331720274813 has 4 divisors (see below), whose sum is σ = 331897005660. Its totient is φ = 331543543968.

The previous prime is 331720274803. The next prime is 331720274819. The reversal of 331720274813 is 318472027133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318472027133 = 13 ⋅24497848241.

It can be written as a sum of positive squares in 2 ways, for example, as 267555838564 + 64164436249 = 517258^2 + 253307^2 .

It is a cyclic number.

It is not a de Polignac number, because 331720274813 - 2¹⁸ = 331720012669 is a prime.

It is a super-2 number, since 2×331720274813² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331720274819) 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, 88362608 + ... + 88366361.

It is an arithmetic number, because the mean of its divisors is an integer number (82974251415).

Almost surely, 2^331720274813 is an apocalyptic number.

It is an amenable number.

331720274813 is a deficient number, since it is larger than the sum of its proper divisors (176730847).

331720274813 is a wasteful number, since it uses less digits than its factorization.

331720274813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176730846.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 331720274813 in words is "three hundred thirty-one billion, seven hundred twenty million, two hundred seventy-four thousand, eight hundred thirteen".