561493787 has 2 divisors, whose sum is σ = 561493788. Its totient is φ = 561493786.

The previous prime is 561493781. The next prime is 561493813. The reversal of 561493787 is 787394165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561493787 - 2⁸ = 561493531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561493781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280746893 + 280746894.

It is an arithmetic number, because the mean of its divisors is an integer number (280746894).

Almost surely, 2^561493787 is an apocalyptic number.

561493787 is a deficient number, since it is larger than the sum of its proper divisors (1).

561493787 is an equidigital number, since it uses as much as digits as its factorization.

561493787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 561493787 is about 23695.8601236587. The cubic root of 561493787 is about 824.9893047894.

The spelling of 561493787 in words is "five hundred sixty-one million, four hundred ninety-three thousand, seven hundred eighty-seven".