561239099 has 2 divisors, whose sum is σ = 561239100. Its totient is φ = 561239098.

The previous prime is 561239033. The next prime is 561239131. The reversal of 561239099 is 990932165.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561239099 is a prime.

It is not a weakly prime, because it can be changed into another prime (561299099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280619549 + 280619550.

It is an arithmetic number, because the mean of its divisors is an integer number (280619550).

Almost surely, 2^561239099 is an apocalyptic number.

561239099 is a deficient number, since it is larger than the sum of its proper divisors (1).

561239099 is an equidigital number, since it uses as much as digits as its factorization.

561239099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 561239099 is about 23690.4854108142. The cubic root of 561239099 is about 824.8645502759.

The spelling of 561239099 in words is "five hundred sixty-one million, two hundred thirty-nine thousand, ninety-nine".