561999929 has 2 divisors, whose sum is σ = 561999930. Its totient is φ = 561999928.

The previous prime is 561999913. The next prime is 561999931. The reversal of 561999929 is 929999165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 454670329 + 107329600 = 21323^2 + 10360^2 .

It is a cyclic number.

It is not a de Polignac number, because 561999929 - 2⁴ = 561999913 is a prime.

Together with 561999931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280999964 + 280999965.

It is an arithmetic number, because the mean of its divisors is an integer number (280999965).

Almost surely, 2^561999929 is an apocalyptic number.

It is an amenable number.

561999929 is a deficient number, since it is larger than the sum of its proper divisors (1).

561999929 is an equidigital number, since it uses as much as digits as its factorization.

561999929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3542940, while the sum is 59.

The square root of 561999929 is about 23706.5376847822. The cubic root of 561999929 is about 825.2371177620.

The spelling of 561999929 in words is "five hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred twenty-nine".