561172291 has 2 divisors, whose sum is σ = 561172292. Its totient is φ = 561172290.

The previous prime is 561172259. The next prime is 561172309. The reversal of 561172291 is 192271165.

561172291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561172291 - 2⁵ = 561172259 is a prime.

It is not a weakly prime, because it can be changed into another prime (561172211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280586145 + 280586146.

It is an arithmetic number, because the mean of its divisors is an integer number (280586146).

Almost surely, 2^561172291 is an apocalyptic number.

561172291 is a deficient number, since it is larger than the sum of its proper divisors (1).

561172291 is an equidigital number, since it uses as much as digits as its factorization.

561172291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 561172291 is about 23689.0753513091. The cubic root of 561172291 is about 824.8318192837.

The spelling of 561172291 in words is "five hundred sixty-one million, one hundred seventy-two thousand, two hundred ninety-one".