561604737 has 4 divisors (see below), whose sum is σ = 748806320. Its totient is φ = 374403156.

The previous prime is 561604699. The next prime is 561604763. The reversal of 561604737 is 737406165.

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 not a de Polignac number, because 561604737 - 2⁷ = 561604609 is a prime.

It is a super-3 number, since 3×561604737³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561604695 and 561604704.

It is not an unprimeable number, because it can be changed into a prime (561604837) 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, 93600787 + ... + 93600792.

It is an arithmetic number, because the mean of its divisors is an integer number (187201580).

Almost surely, 2^561604737 is an apocalyptic number.

It is an amenable number.

561604737 is a deficient number, since it is larger than the sum of its proper divisors (187201583).

561604737 is a wasteful number, since it uses less digits than its factorization.

561604737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187201582.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 561604737 is about 23698.2011342633. The cubic root of 561604737 is about 825.0436399321.

The spelling of 561604737 in words is "five hundred sixty-one million, six hundred four thousand, seven hundred thirty-seven".