561139500 has 48 divisors (see below), whose sum is σ = 1634042592. Its totient is φ = 149636800.

The previous prime is 561139499. The next prime is 561139541. The reversal of 561139500 is 5931165.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185547 + ... + 188546.

It is an arithmetic number, because the mean of its divisors is an integer number (34042554).

Almost surely, 2^561139500 is an apocalyptic number.

561139500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561139500 is an abundant number, since it is smaller than the sum of its proper divisors (1072903092).

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

561139500 is a wasteful number, since it uses less digits than its factorization.

561139500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374115 (or 374103 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 561139500 is about 23688.3832289162. The cubic root of 561139500 is about 824.8157531620.

The spelling of 561139500 in words is "five hundred sixty-one million, one hundred thirty-nine thousand, five hundred".