561110491 has 2 divisors, whose sum is σ = 561110492. Its totient is φ = 561110490.

The previous prime is 561110479. The next prime is 561110497. The reversal of 561110491 is 194011165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561110491 - 2²¹ = 559013339 is a prime.

It is a super-2 number, since 2×561110491² = 629689966220522162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561110497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280555245 + 280555246.

It is an arithmetic number, because the mean of its divisors is an integer number (280555246).

Almost surely, 2^561110491 is an apocalyptic number.

561110491 is a deficient number, since it is larger than the sum of its proper divisors (1).

561110491 is an equidigital number, since it uses as much as digits as its factorization.

561110491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 561110491 is about 23687.7709166566. The cubic root of 561110491 is about 824.8015395292.

The spelling of 561110491 in words is "five hundred sixty-one million, one hundred ten thousand, four hundred ninety-one".