561806263 has 2 divisors, whose sum is σ = 561806264. Its totient is φ = 561806262.

The previous prime is 561806251. The next prime is 561806291. The reversal of 561806263 is 362608165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561806263 - 2¹³ = 561798071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561806243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280903131 + 280903132.

It is an arithmetic number, because the mean of its divisors is an integer number (280903132).

Almost surely, 2^561806263 is an apocalyptic number.

561806263 is a deficient number, since it is larger than the sum of its proper divisors (1).

561806263 is an equidigital number, since it uses as much as digits as its factorization.

561806263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 561806263 is about 23702.4526789951. The cubic root of 561806263 is about 825.1423142308.

The spelling of 561806263 in words is "five hundred sixty-one million, eight hundred six thousand, two hundred sixty-three".