561723653 has 2 divisors, whose sum is σ = 561723654. Its totient is φ = 561723652.

The previous prime is 561723629. The next prime is 561723661. The reversal of 561723653 is 356327165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377252929 + 184470724 = 19423^2 + 13582^2 .

It is a cyclic number.

It is not a de Polignac number, because 561723653 - 2¹⁶ = 561658117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561723853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280861826 + 280861827.

It is an arithmetic number, because the mean of its divisors is an integer number (280861827).

Almost surely, 2^561723653 is an apocalyptic number.

It is an amenable number.

561723653 is a deficient number, since it is larger than the sum of its proper divisors (1).

561723653 is an equidigital number, since it uses as much as digits as its factorization.

561723653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 38.

The square root of 561723653 is about 23700.7099682689. The cubic root of 561723653 is about 825.1018682904.

The spelling of 561723653 in words is "five hundred sixty-one million, seven hundred twenty-three thousand, six hundred fifty-three".