561637247 has 2 divisors, whose sum is σ = 561637248. Its totient is φ = 561637246.

The previous prime is 561637231. The next prime is 561637273. The reversal of 561637247 is 742736165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561637247 - 2⁴ = 561637231 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 (561637547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280818623 + 280818624.

It is an arithmetic number, because the mean of its divisors is an integer number (280818624).

Almost surely, 2^561637247 is an apocalyptic number.

561637247 is a deficient number, since it is larger than the sum of its proper divisors (1).

561637247 is an equidigital number, since it uses as much as digits as its factorization.

561637247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 41.

The square root of 561637247 is about 23698.8870413781. The cubic root of 561637247 is about 825.0595595813.

The spelling of 561637247 in words is "five hundred sixty-one million, six hundred thirty-seven thousand, two hundred forty-seven".