561604499 has 4 divisors (see below), whose sum is σ = 561655200. Its totient is φ = 561553800.

The previous prime is 561604471. The next prime is 561604523. The reversal of 561604499 is 994406165.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 561604499 - 2⁸ = 561604243 is a prime.

It is a super-2 number, since 2×561604499² = 630799226594082002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561604699) 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, 827 + ... + 33524.

It is an arithmetic number, because the mean of its divisors is an integer number (140413800).

Almost surely, 2^561604499 is an apocalyptic number.

561604499 is a deficient number, since it is larger than the sum of its proper divisors (50701).

561604499 is a wasteful number, since it uses less digits than its factorization.

561604499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50700.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 561604499 is about 23698.1961127846. The cubic root of 561604499 is about 825.0435233849.

The spelling of 561604499 in words is "five hundred sixty-one million, six hundred four thousand, four hundred ninety-nine".