561555597 has 4 divisors (see below), whose sum is σ = 748740800. Its totient is φ = 374370396.

The previous prime is 561555593. The next prime is 561555613. The reversal of 561555597 is 795555165.

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 561555597 - 2² = 561555593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561555593) 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, 93592597 + ... + 93592602.

It is an arithmetic number, because the mean of its divisors is an integer number (187185200).

Almost surely, 2^561555597 is an apocalyptic number.

It is an amenable number.

561555597 is a deficient number, since it is larger than the sum of its proper divisors (187185203).

561555597 is a wasteful number, since it uses less digits than its factorization.

561555597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187185202.

The product of its digits is 1181250, while the sum is 48.

The square root of 561555597 is about 23697.1643240283. The cubic root of 561555597 is about 825.0195756604.

The spelling of 561555597 in words is "five hundred sixty-one million, five hundred fifty-five thousand, five hundred ninety-seven".