561878497 has 2 divisors, whose sum is σ = 561878498. Its totient is φ = 561878496.

The previous prime is 561878489. The next prime is 561878501. The reversal of 561878497 is 794878165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527115681 + 34762816 = 22959^2 + 5896^2 .

It is a cyclic number.

It is not a de Polignac number, because 561878497 - 2³ = 561878489 is a prime.

It is not a weakly prime, because it can be changed into another prime (561878437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280939248 + 280939249.

It is an arithmetic number, because the mean of its divisors is an integer number (280939249).

Almost surely, 2^561878497 is an apocalyptic number.

It is an amenable number.

561878497 is a deficient number, since it is larger than the sum of its proper divisors (1).

561878497 is an equidigital number, since it uses as much as digits as its factorization.

561878497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 55.

The square root of 561878497 is about 23703.9763963770. The cubic root of 561878497 is about 825.1776768220.

The spelling of 561878497 in words is "five hundred sixty-one million, eight hundred seventy-eight thousand, four hundred ninety-seven".