561272100 has 36 divisors (see below), whose sum is σ = 1623948144. Its totient is φ = 149672480.

The previous prime is 561272093. The next prime is 561272161. The reversal of 561272100 is 1272165.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 935154 + ... + 935753.

Almost surely, 2^561272100 is an apocalyptic number.

561272100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561272100 is an abundant number, since it is smaller than the sum of its proper divisors (1062676044).

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

561272100 is a wasteful number, since it uses less digits than its factorization.

561272100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870924 (or 1870917 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 561272100 is about 23691.1819038224. The cubic root of 561272100 is about 824.8807173733.

The spelling of 561272100 in words is "five hundred sixty-one million, two hundred seventy-two thousand, one hundred".