561994253 has 2 divisors, whose sum is σ = 561994254. Its totient is φ = 561994252.

The previous prime is 561994243. The next prime is 561994267. The reversal of 561994253 is 352499165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446603689 + 115390564 = 21133^2 + 10742^2 .

It is a cyclic number.

It is not a de Polignac number, because 561994253 - 2¹⁴ = 561977869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561994243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280997126 + 280997127.

It is an arithmetic number, because the mean of its divisors is an integer number (280997127).

Almost surely, 2^561994253 is an apocalyptic number.

It is an amenable number.

561994253 is a deficient number, since it is larger than the sum of its proper divisors (1).

561994253 is an equidigital number, since it uses as much as digits as its factorization.

561994253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 44.

The square root of 561994253 is about 23706.4179706678. The cubic root of 561994253 is about 825.2343395519.

The spelling of 561994253 in words is "five hundred sixty-one million, nine hundred ninety-four thousand, two hundred fifty-three".