331739993 has 4 divisors (see below), whose sum is σ = 357258468. Its totient is φ = 306221520.

The previous prime is 331739953. The next prime is 331740011. The reversal of 331739993 is 399937133.

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: 399937133 = 23 ⋅17388571.

It can be written as a sum of positive squares in 2 ways, for example, as 21557449 + 310182544 = 4643^2 + 17612^2 .

It is a cyclic number.

It is not a de Polignac number, because 331739993 - 2²² = 327545689 is a prime.

It is a super-2 number, since 2×331739993² = 220102845911280098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (331739953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12759218 + ... + 12759243.

It is an arithmetic number, because the mean of its divisors is an integer number (89314617).

Almost surely, 2^331739993 is an apocalyptic number.

It is an amenable number.

331739993 is a deficient number, since it is larger than the sum of its proper divisors (25518475).

331739993 is a wasteful number, since it uses less digits than its factorization.

331739993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25518474.

The product of its digits is 413343, while the sum is 47.

The square root of 331739993 is about 18213.7308918299. The cubic root of 331739993 is about 692.2547489178.

The spelling of 331739993 in words is "three hundred thirty-one million, seven hundred thirty-nine thousand, nine hundred ninety-three".