499813661 has 4 divisors (see below), whose sum is σ = 500421792. Its totient is φ = 499205532.

The previous prime is 499813627. The next prime is 499813663. The reversal of 499813661 is 166318994.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 499813661 - 2⁶ = 499813597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499813663) 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, 302831 + ... + 304476.

It is an arithmetic number, because the mean of its divisors is an integer number (125105448).

Almost surely, 2^499813661 is an apocalyptic number.

It is an amenable number.

499813661 is a deficient number, since it is larger than the sum of its proper divisors (608131).

499813661 is an equidigital number, since it uses as much as digits as its factorization.

499813661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608130.

The product of its digits is 279936, while the sum is 47.

The square root of 499813661 is about 22356.5127200107. The cubic root of 499813661 is about 793.6019154916.

The spelling of 499813661 in words is "four hundred ninety-nine million, eight hundred thirteen thousand, six hundred sixty-one".