561215807 has 2 divisors, whose sum is σ = 561215808. Its totient is φ = 561215806.

The previous prime is 561215789. The next prime is 561215827. The reversal of 561215807 is 708512165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561215807 - 2¹⁰ = 561214783 is a prime.

It is a super-2 number, since 2×561215807² = 629926364053322498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561215827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280607903 + 280607904.

It is an arithmetic number, because the mean of its divisors is an integer number (280607904).

Almost surely, 2^561215807 is an apocalyptic number.

561215807 is a deficient number, since it is larger than the sum of its proper divisors (1).

561215807 is an equidigital number, since it uses as much as digits as its factorization.

561215807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 561215807 is about 23689.9938159553. The cubic root of 561215807 is about 824.8531392089.

The spelling of 561215807 in words is "five hundred sixty-one million, two hundred fifteen thousand, eight hundred seven".