561353500 has 48 divisors (see below), whose sum is σ = 1233977472. Its totient is φ = 223080000.

The previous prime is 561353497. The next prime is 561353501. The reversal of 561353500 is 5353165.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561353501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74925 + ... + 82075.

It is an arithmetic number, because the mean of its divisors is an integer number (25707864).

Almost surely, 2^561353500 is an apocalyptic number.

561353500 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 561353500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (616988736).

561353500 is an abundant number, since it is smaller than the sum of its proper divisors (672623972).

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

561353500 is a wasteful number, since it uses less digits than its factorization.

561353500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7327 (or 7315 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 28.

The square root of 561353500 is about 23692.8997803139. The cubic root of 561353500 is about 824.9205922959.

It can be divided in two parts, 561 and 353500, that added together give a triangular number (354061 = T₈₄₁).

The spelling of 561353500 in words is "five hundred sixty-one million, three hundred fifty-three thousand, five hundred".