561499361 has 2 divisors, whose sum is σ = 561499362. Its totient is φ = 561499360.

The previous prime is 561499349. The next prime is 561499369. The reversal of 561499361 is 163994165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498137761 + 63361600 = 22319^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 561499361 - 2⁶ = 561499297 is a prime.

It is not a weakly prime, because it can be changed into another prime (561499369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280749680 + 280749681.

It is an arithmetic number, because the mean of its divisors is an integer number (280749681).

Almost surely, 2^561499361 is an apocalyptic number.

It is an amenable number.

561499361 is a deficient number, since it is larger than the sum of its proper divisors (1).

561499361 is an equidigital number, since it uses as much as digits as its factorization.

561499361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 561499361 is about 23695.9777388484. The cubic root of 561499361 is about 824.9920346951.

The spelling of 561499361 in words is "five hundred sixty-one million, four hundred ninety-nine thousand, three hundred sixty-one".