561781152 has 36 divisors (see below), whose sum is σ = 1597565970. Its totient is φ = 187260288.

The previous prime is 561781109. The next prime is 561781159. The reversal of 561781152 is 251187165.

561781152 is a `hidden beast` number, since 561 + 7 + 81 + 15 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 505170576 + 56610576 = 22476^2 + 7524^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (561781159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 975027 + ... + 975602.

Almost surely, 2^561781152 is an apocalyptic number.

It is an amenable number.

561781152 is an abundant number, since it is smaller than the sum of its proper divisors (1035784818).

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

561781152 is a wasteful number, since it uses less digits than its factorization.

561781152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950645 (or 1950634 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 561781152 is about 23701.9229599626. The cubic root of 561781152 is about 825.1300202790.

The spelling of 561781152 in words is "five hundred sixty-one million, seven hundred eighty-one thousand, one hundred fifty-two".