561489287 has 2 divisors, whose sum is σ = 561489288. Its totient is φ = 561489286.

The previous prime is 561489251. The next prime is 561489347. The reversal of 561489287 is 782984165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561489287 - 2⁶ = 561489223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561489217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280744643 + 280744644.

It is an arithmetic number, because the mean of its divisors is an integer number (280744644).

Almost surely, 2^561489287 is an apocalyptic number.

561489287 is a deficient number, since it is larger than the sum of its proper divisors (1).

561489287 is an equidigital number, since it uses as much as digits as its factorization.

561489287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 561489287 is about 23695.7651701733. The cubic root of 561489287 is about 824.9871008696.

The spelling of 561489287 in words is "five hundred sixty-one million, four hundred eighty-nine thousand, two hundred eighty-seven".