561310500 has 96 divisors (see below), whose sum is σ = 1674586368. Its totient is φ = 146016000.

The previous prime is 561310489. The next prime is 561310517. The reversal of 561310500 is 5013165.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56937 + ... + 66063.

It is an arithmetic number, because the mean of its divisors is an integer number (17443608).

Almost surely, 2^561310500 is an apocalyptic number.

561310500 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 561310500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837293184).

561310500 is an abundant number, since it is smaller than the sum of its proper divisors (1113275868).

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

561310500 is a wasteful number, since it uses less digits than its factorization.

561310500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190 (or 9178 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 561310500 is about 23691.9923180808. The cubic root of 561310500 is about 824.8995286279.

Adding to 561310500 its reverse (5013165), we get a palindrome (566323665).

The spelling of 561310500 in words is "five hundred sixty-one million, three hundred ten thousand, five hundred".