561198791 has 2 divisors, whose sum is σ = 561198792. Its totient is φ = 561198790.

The previous prime is 561198779. The next prime is 561198851. The reversal of 561198791 is 197891165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561198791 - 2¹⁴ = 561182407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561198751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280599395 + 280599396.

It is an arithmetic number, because the mean of its divisors is an integer number (280599396).

Almost surely, 2^561198791 is an apocalyptic number.

561198791 is a deficient number, since it is larger than the sum of its proper divisors (1).

561198791 is an equidigital number, since it uses as much as digits as its factorization.

561198791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 47.

The square root of 561198791 is about 23689.6346742621. The cubic root of 561198791 is about 824.8448026399.

The spelling of 561198791 in words is "five hundred sixty-one million, one hundred ninety-eight thousand, seven hundred ninety-one".