561773623 has 2 divisors, whose sum is σ = 561773624. Its totient is φ = 561773622.

The previous prime is 561773609. The next prime is 561773669. The reversal of 561773623 is 326377165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561773623 - 2⁵ = 561773591 is a prime.

It is a super-2 number, since 2×561773623² = 631179206997092258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561773603) 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, 280886811 + 280886812.

It is an arithmetic number, because the mean of its divisors is an integer number (280886812).

Almost surely, 2^561773623 is an apocalyptic number.

561773623 is a deficient number, since it is larger than the sum of its proper divisors (1).

561773623 is an equidigital number, since it uses as much as digits as its factorization.

561773623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 40.

The square root of 561773623 is about 23701.7641326548. The cubic root of 561773623 is about 825.1263341273.

The spelling of 561773623 in words is "five hundred sixty-one million, seven hundred seventy-three thousand, six hundred twenty-three".