331775993 has 4 divisors (see below), whose sum is σ = 331941540. Its totient is φ = 331610448.

The previous prime is 331775879. The next prime is 331776001. The reversal of 331775993 is 399577133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399577133 = 4663 ⋅85691.

It can be written as a sum of positive squares in 2 ways, for example, as 307932304 + 23843689 = 17548^2 + 4883^2 .

It is a cyclic number.

It is not a de Polignac number, because 331775993 - 2¹⁴ = 331759609 is a prime.

It is a super-2 number, since 2×331775993² = 220150619062272098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331775293) 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, 79730 + ... + 83787.

It is an arithmetic number, because the mean of its divisors is an integer number (82985385).

Almost surely, 2^331775993 is an apocalyptic number.

It is an amenable number.

331775993 is a deficient number, since it is larger than the sum of its proper divisors (165547).

331775993 is a wasteful number, since it uses less digits than its factorization.

331775993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165546.

The product of its digits is 535815, while the sum is 47.

The square root of 331775993 is about 18214.7191304176. The cubic root of 331775993 is about 692.2797888789.

The spelling of 331775993 in words is "three hundred thirty-one million, seven hundred seventy-five thousand, nine hundred ninety-three".