561597500 has 60 divisors (see below), whose sum is σ = 1258284720. Its totient is φ = 219120000.

The previous prime is 561597481. The next prime is 561597521. The reversal of 561597500 is 5795165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 99761 + ... + 105239.

It is an arithmetic number, because the mean of its divisors is an integer number (20971412).

Almost surely, 2^561597500 is an apocalyptic number.

561597500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561597500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (629142360).

561597500 is an abundant number, since it is smaller than the sum of its proper divisors (696687220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561597500 is a wasteful number, since it uses less digits than its factorization.

561597500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544 (or 5527 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 561597500 is about 23698.0484428571. The cubic root of 561597500 is about 825.0400960004.

The spelling of 561597500 in words is "five hundred sixty-one million, five hundred ninety-seven thousand, five hundred".