561774253 has 4 divisors (see below), whose sum is σ = 565544700. Its totient is φ = 558003808.

The previous prime is 561774233. The next prime is 561774271. The reversal of 561774253 is 352477165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 335512489 + 226261764 = 18317^2 + 15042^2 .

It is a de Polignac number, because none of the positive numbers 2^k-561774253 is a prime.

It is a super-2 number, since 2×561774253² = 631180622667416018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561774203) 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, 1885000 + ... + 1885297.

It is an arithmetic number, because the mean of its divisors is an integer number (141386175).

Almost surely, 2^561774253 is an apocalyptic number.

It is an amenable number.

561774253 is a deficient number, since it is larger than the sum of its proper divisors (3770447).

561774253 is a wasteful number, since it uses less digits than its factorization.

561774253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770446.

The product of its digits is 176400, while the sum is 40.

The square root of 561774253 is about 23701.7774228010. Note that the first 3 decimals coincide. The cubic root of 561774253 is about 825.1266425727.

The spelling of 561774253 in words is "five hundred sixty-one million, seven hundred seventy-four thousand, two hundred fifty-three".