561551557 has 8 divisors (see below), whose sum is σ = 652651200. Its totient is φ = 473171424.

The previous prime is 561551537. The next prime is 561551581. The reversal of 561551557 is 755155165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561551557 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 (561551537) 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 7 ways as a sum of consecutive naturals, for example, 679432 + ... + 680257.

It is an arithmetic number, because the mean of its divisors is an integer number (81581400).

Almost surely, 2^561551557 is an apocalyptic number.

It is an amenable number.

561551557 is a deficient number, since it is larger than the sum of its proper divisors (91099643).

561551557 is a wasteful number, since it uses less digits than its factorization.

561551557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359755.

The product of its digits is 131250, while the sum is 40.

The square root of 561551557 is about 23697.0790816083. The cubic root of 561551557 is about 825.0175971759.

The spelling of 561551557 in words is "five hundred sixty-one million, five hundred fifty-one thousand, five hundred fifty-seven".