499561 has 4 divisors (see below), whose sum is σ = 500992. Its totient is φ = 498132.

The previous prime is 499559. The next prime is 499571. The reversal of 499561 is 165994.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165994 = 2 ⋅82997.

It is a cyclic number.

It is not a de Polignac number, because 499561 - 2¹ = 499559 is a prime.

It is a super-2 number, since 2×499561² = 499122385442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196 + ... + 1018.

It is an arithmetic number, because the mean of its divisors is an integer number (125248).

2⁴⁹⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

499561 is a deficient number, since it is larger than the sum of its proper divisors (1431).

499561 is an equidigital number, since it uses as much as digits as its factorization.

499561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430.

The product of its digits is 9720, while the sum is 34.

The square root of 499561 is about 706.7962931425. The cubic root of 499561 is about 79.3468168280.

The spelling of 499561 in words is "four hundred ninety-nine thousand, five hundred sixty-one".