561321499 has 2 divisors, whose sum is σ = 561321500. Its totient is φ = 561321498.

The previous prime is 561321473. The next prime is 561321559. The reversal of 561321499 is 994123165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561321499 - 2⁹ = 561320987 is a prime.

It is not a weakly prime, because it can be changed into another prime (561321899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280660749 + 280660750.

It is an arithmetic number, because the mean of its divisors is an integer number (280660750).

Almost surely, 2^561321499 is an apocalyptic number.

561321499 is a deficient number, since it is larger than the sum of its proper divisors (1).

561321499 is an equidigital number, since it uses as much as digits as its factorization.

561321499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 561321499 is about 23692.2244417868. The cubic root of 561321499 is about 824.9049166206.

The spelling of 561321499 in words is "five hundred sixty-one million, three hundred twenty-one thousand, four hundred ninety-nine".