499649531 has 4 divisors (see below), whose sum is σ = 500118000. Its totient is φ = 499181064.

The previous prime is 499649519. The next prime is 499649543. The reversal of 499649531 is 135946994.

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

It is an interprime number because it is at equal distance from previous prime (499649519) and next prime (499649543).

It is a cyclic number.

It is not a de Polignac number, because 499649531 - 2¹⁰ = 499648507 is a prime.

It is a super-2 number, since 2×499649531² = 499299307657039922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 499649531.

It is not an unprimeable number, because it can be changed into a prime (499649131) 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, 232631 + ... + 234768.

It is an arithmetic number, because the mean of its divisors is an integer number (125029500).

Almost surely, 2^499649531 is an apocalyptic number.

499649531 is a deficient number, since it is larger than the sum of its proper divisors (468469).

499649531 is a wasteful number, since it uses less digits than its factorization.

499649531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468468.

The product of its digits is 1049760, while the sum is 50.

The square root of 499649531 is about 22352.8416761717. The cubic root of 499649531 is about 793.5150376857.

It can be divided in two parts, 49964 and 9531, that added together give a palindrome (59495).

The spelling of 499649531 in words is "four hundred ninety-nine million, six hundred forty-nine thousand, five hundred thirty-one".