561999937 has 2 divisors, whose sum is σ = 561999938. Its totient is φ = 561999936.

The previous prime is 561999931. The next prime is 561999941. The reversal of 561999937 is 739999165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553143361 + 8856576 = 23519^2 + 2976^2 .

It is a cyclic number.

It is not a de Polignac number, because 561999937 - 2³ = 561999929 is a prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (561999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280999968 + 280999969.

It is an arithmetic number, because the mean of its divisors is an integer number (280999969).

Almost surely, 2^561999937 is an apocalyptic number.

It is an amenable number.

561999937 is a deficient number, since it is larger than the sum of its proper divisors (1).

561999937 is an equidigital number, since it uses as much as digits as its factorization.

561999937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4133430, while the sum is 58.

The square root of 561999937 is about 23706.5378535121. The cubic root of 561999937 is about 825.2371216777.

The spelling of 561999937 in words is "five hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred thirty-seven".