561180987 has 36 divisors (see below), whose sum is σ = 858291960. Its totient is φ = 362385792.

The previous prime is 561180973. The next prime is 561180989. The reversal of 561180987 is 789081165.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

561180987 is a `hidden beast` number, since 561 + 1 + 8 + 0 + 9 + 87 = 666.

It is not a de Polignac number, because 561180987 - 2⁷ = 561180859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561180989) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5785323 + ... + 5785419.

Almost surely, 2^561180987 is an apocalyptic number.

561180987 is a deficient number, since it is larger than the sum of its proper divisors (297110973).

561180987 is an frugal number, since it uses more digits than its factorization.

561180987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 561180987 is about 23689.2588951195. The cubic root of 561180987 is about 824.8360798294.

The spelling of 561180987 in words is "five hundred sixty-one million, one hundred eighty thousand, nine hundred eighty-seven".