561166751 has 2 divisors, whose sum is σ = 561166752. Its totient is φ = 561166750.

The previous prime is 561166721. The next prime is 561166757. The reversal of 561166751 is 157661165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561166751 - 2⁶ = 561166687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561166757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280583375 + 280583376.

It is an arithmetic number, because the mean of its divisors is an integer number (280583376).

Almost surely, 2^561166751 is an apocalyptic number.

561166751 is a deficient number, since it is larger than the sum of its proper divisors (1).

561166751 is an equidigital number, since it uses as much as digits as its factorization.

561166751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 561166751 is about 23688.9584194831. The cubic root of 561166751 is about 824.8291049757.

The spelling of 561166751 in words is "five hundred sixty-one million, one hundred sixty-six thousand, seven hundred fifty-one".