561117061 has 2 divisors, whose sum is σ = 561117062. Its totient is φ = 561117060.

The previous prime is 561117059. The next prime is 561117071. The reversal of 561117061 is 160711165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523540161 + 37576900 = 22881^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 561117061 - 2¹ = 561117059 is a prime.

It is a super-2 number, since 2×561117061² = 629704712290555442, which contains 22 as substring.

Together with 561117059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561117001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280558530 + 280558531.

It is an arithmetic number, because the mean of its divisors is an integer number (280558531).

Almost surely, 2^561117061 is an apocalyptic number.

It is an amenable number.

561117061 is a deficient number, since it is larger than the sum of its proper divisors (1).

561117061 is an equidigital number, since it uses as much as digits as its factorization.

561117061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 561117061 is about 23687.9095954033. The cubic root of 561117061 is about 824.8047586961.

The spelling of 561117061 in words is "five hundred sixty-one million, one hundred seventeen thousand, sixty-one".