499991831 has 4 divisors (see below), whose sum is σ = 511619592. Its totient is φ = 488364072.

The previous prime is 499991827. The next prime is 499991837. The reversal of 499991831 is 138199994.

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

It is not a de Polignac number, because 499991831 - 2² = 499991827 is a prime.

It is a super-2 number, since 2×499991831² = 499983662133465122, 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 (499991837) 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, 5813816 + ... + 5813901.

It is an arithmetic number, because the mean of its divisors is an integer number (127904898).

Almost surely, 2^499991831 is an apocalyptic number.

499991831 is a deficient number, since it is larger than the sum of its proper divisors (11627761).

499991831 is a wasteful number, since it uses less digits than its factorization.

499991831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11627760.

The product of its digits is 629856, while the sum is 53.

The square root of 499991831 is about 22360.4971098587. The cubic root of 499991831 is about 793.6962034675.

The spelling of 499991831 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, eight hundred thirty-one".