561373500 has 96 divisors (see below), whose sum is σ = 1642088448. Its totient is φ = 149025600.

The previous prime is 561373433. The next prime is 561373523. The reversal of 561373500 is 5373165.

561373500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent 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, 393789 + ... + 395211.

It is an arithmetic number, because the mean of its divisors is an integer number (17105088).

Almost surely, 2^561373500 is an apocalyptic number.

561373500 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 561373500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821044224).

561373500 is an abundant number, since it is smaller than the sum of its proper divisors (1080714948).

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

561373500 is a wasteful number, since it uses less digits than its factorization.

561373500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1696 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 30.

The square root of 561373500 is about 23693.3218439289. The cubic root of 561373500 is about 824.9303889843.

The spelling of 561373500 in words is "five hundred sixty-one million, three hundred seventy-three thousand, five hundred".