561166997 has 2 divisors, whose sum is σ = 561166998. Its totient is φ = 561166996.

The previous prime is 561166979. The next prime is 561167027. The reversal of 561166997 is 799661165.

561166997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (561166979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556676836 + 4490161 = 23594^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 561166997 - 2¹⁰ = 561165973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561166897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280583498 + 280583499.

It is an arithmetic number, because the mean of its divisors is an integer number (280583499).

Almost surely, 2^561166997 is an apocalyptic number.

It is an amenable number.

561166997 is a deficient number, since it is larger than the sum of its proper divisors (1).

561166997 is an equidigital number, since it uses as much as digits as its factorization.

561166997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 50.

The square root of 561166997 is about 23688.9636117750. The cubic root of 561166997 is about 824.8292255032.

The spelling of 561166997 in words is "five hundred sixty-one million, one hundred sixty-six thousand, nine hundred ninety-seven".