561172842 has 24 divisors (see below), whose sum is σ = 1227242016. Its totient is φ = 185308776.

The previous prime is 561172817. The next prime is 561172849. The reversal of 561172842 is 248271165.

561172842 is a `hidden beast` number, since 561 + 17 + 2 + 84 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 561172797 and 561172806.

It is not an unprimeable number, because it can be changed into a prime (561172849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143758 + ... + 147609.

It is an arithmetic number, because the mean of its divisors is an integer number (51135084).

Almost surely, 2^561172842 is an apocalyptic number.

561172842 is an abundant number, since it is smaller than the sum of its proper divisors (666069174).

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

561172842 is a wasteful number, since it uses less digits than its factorization.

561172842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291482 (or 291479 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 561172842 is about 23689.0869811396. The cubic root of 561172842 is about 824.8320892437.

The spelling of 561172842 in words is "five hundred sixty-one million, one hundred seventy-two thousand, eight hundred forty-two".