561418381 has 2 divisors, whose sum is σ = 561418382. Its totient is φ = 561418380.

The previous prime is 561418313. The next prime is 561418439. The reversal of 561418381 is 183814165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377680356 + 183738025 = 19434^2 + 13555^2 .

It is a cyclic number.

It is not a de Polignac number, because 561418381 - 2¹³ = 561410189 is a prime.

It is a super-2 number, since 2×561418381² = 630381197049322322, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 561418381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561418181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280709190 + 280709191.

It is an arithmetic number, because the mean of its divisors is an integer number (280709191).

Almost surely, 2^561418381 is an apocalyptic number.

It is an amenable number.

561418381 is a deficient number, since it is larger than the sum of its proper divisors (1).

561418381 is an equidigital number, since it uses as much as digits as its factorization.

561418381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 37.

The square root of 561418381 is about 23694.2689484187. The cubic root of 561418381 is about 824.9523723959.

The spelling of 561418381 in words is "five hundred sixty-one million, four hundred eighteen thousand, three hundred eighty-one".