561117187 has 2 divisors, whose sum is σ = 561117188. Its totient is φ = 561117186.

The previous prime is 561117169. The next prime is 561117203. The reversal of 561117187 is 781711165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561117187 - 2⁷ = 561117059 is a prime.

It is not a weakly prime, because it can be changed into another prime (561117127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280558593 + 280558594.

It is an arithmetic number, because the mean of its divisors is an integer number (280558594).

Almost surely, 2^561117187 is an apocalyptic number.

561117187 is a deficient number, since it is larger than the sum of its proper divisors (1).

561117187 is an equidigital number, since it uses as much as digits as its factorization.

561117187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 37.

The square root of 561117187 is about 23687.9122549878. The cubic root of 561117187 is about 824.8048204333.

The spelling of 561117187 in words is "five hundred sixty-one million, one hundred seventeen thousand, one hundred eighty-seven".