331791493 has 4 divisors (see below), whose sum is σ = 361954368. Its totient is φ = 301628620.

The previous prime is 331791479. The next prime is 331791503. The reversal of 331791493 is 394197133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 331791493 - 2⁹ = 331790981 is a prime.

It is a super-2 number, since 2×331791493² = 220171189654338098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331791293) 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, 15081421 + ... + 15081442.

It is an arithmetic number, because the mean of its divisors is an integer number (90488592).

Almost surely, 2^331791493 is an apocalyptic number.

It is an amenable number.

331791493 is a deficient number, since it is larger than the sum of its proper divisors (30162875).

331791493 is a wasteful number, since it uses less digits than its factorization.

331791493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30162874.

The product of its digits is 61236, while the sum is 40.

The square root of 331791493 is about 18215.1446055199. The cubic root of 331791493 is about 692.2905694154.

The spelling of 331791493 in words is "three hundred thirty-one million, seven hundred ninety-one thousand, four hundred ninety-three".