631028239 has 4 divisors (see below), whose sum is σ = 631263040. Its totient is φ = 630793440.

The previous prime is 631028231. The next prime is 631028243. The reversal of 631028239 is 932820136.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 631028239 - 2³ = 631028231 is a prime.

It is a super-2 number, since 2×631028239² = 796393276830882242, 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 (631028231) 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, 113322 + ... + 118759.

It is an arithmetic number, because the mean of its divisors is an integer number (157815760).

Almost surely, 2^631028239 is an apocalyptic number.

631028239 is a deficient number, since it is larger than the sum of its proper divisors (234801).

631028239 is a wasteful number, since it uses less digits than its factorization.

631028239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234800.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 631028239 is about 25120.2754562923. The cubic root of 631028239 is about 857.7280210274.

The spelling of 631028239 in words is "six hundred thirty-one million, twenty-eight thousand, two hundred thirty-nine".