561242237 has 2 divisors, whose sum is σ = 561242238. Its totient is φ = 561242236.

The previous prime is 561242173. The next prime is 561242299. The reversal of 561242237 is 732242165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557951641 + 3290596 = 23621^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 561242237 - 2⁶ = 561242173 is a prime.

It is a Chen prime.

It is equal to p_29403761 and since 561242237 and 29403761 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561242137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280621118 + 280621119.

It is an arithmetic number, because the mean of its divisors is an integer number (280621119).

Almost surely, 2^561242237 is an apocalyptic number.

It is an amenable number.

561242237 is a deficient number, since it is larger than the sum of its proper divisors (1).

561242237 is an equidigital number, since it uses as much as digits as its factorization.

561242237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

The square root of 561242237 is about 23690.5516398416. The cubic root of 561242237 is about 824.8660876006.

The spelling of 561242237 in words is "five hundred sixty-one million, two hundred forty-two thousand, two hundred thirty-seven".