561318253 has 4 divisors (see below), whose sum is σ = 561698748. Its totient is φ = 560937760.

The previous prime is 561318221. The next prime is 561318269. The reversal of 561318253 is 352813165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352813165 = 5 ⋅70562633.

It can be written as a sum of positive squares in 2 ways, for example, as 115390564 + 445927689 = 10742^2 + 21117^2 .

It is a cyclic number.

It is not a de Polignac number, because 561318253 - 2⁵ = 561318221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561318353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188026 + ... + 190987.

It is an arithmetic number, because the mean of its divisors is an integer number (140424687).

Almost surely, 2^561318253 is an apocalyptic number.

It is an amenable number.

561318253 is a deficient number, since it is larger than the sum of its proper divisors (380495).

561318253 is a wasteful number, since it uses less digits than its factorization.

561318253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380494.

The product of its digits is 21600, while the sum is 34.

The square root of 561318253 is about 23692.1559382003. The cubic root of 561318253 is about 824.9033265357.

The spelling of 561318253 in words is "five hundred sixty-one million, three hundred eighteen thousand, two hundred fifty-three".