561419681 has 2 divisors, whose sum is σ = 561419682. Its totient is φ = 561419680.

The previous prime is 561419603. The next prime is 561419699. The reversal of 561419681 is 186914165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 465869056 + 95550625 = 21584^2 + 9775^2 .

It is a cyclic number.

It is not a de Polignac number, because 561419681 - 2¹⁰ = 561418657 is a prime.

It is a super-2 number, since 2×561419681² = 630384116428283522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561413681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280709840 + 280709841.

It is an arithmetic number, because the mean of its divisors is an integer number (280709841).

Almost surely, 2^561419681 is an apocalyptic number.

It is an amenable number.

561419681 is a deficient number, since it is larger than the sum of its proper divisors (1).

561419681 is an equidigital number, since it uses as much as digits as its factorization.

561419681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 561419681 is about 23694.2963811969. The cubic root of 561419681 is about 824.9530091386.

The spelling of 561419681 in words is "five hundred sixty-one million, four hundred nineteen thousand, six hundred eighty-one".