561439271 has 4 divisors (see below), whose sum is σ = 566590200. Its totient is φ = 556288344.

The previous prime is 561439259. The next prime is 561439273. The reversal of 561439271 is 172934165.

561439271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 561439271 - 2¹⁰ = 561438247 is a prime.

It is a super-2 number, since 2×561439271² = 630428110042022882, 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 (561439273) 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, 2575301 + ... + 2575518.

It is an arithmetic number, because the mean of its divisors is an integer number (141647550).

Almost surely, 2^561439271 is an apocalyptic number.

561439271 is a deficient number, since it is larger than the sum of its proper divisors (5150929).

561439271 is a wasteful number, since it uses less digits than its factorization.

561439271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150928.

The product of its digits is 45360, while the sum is 38.

The square root of 561439271 is about 23694.7097682162. The cubic root of 561439271 is about 824.9626042431.

The spelling of 561439271 in words is "five hundred sixty-one million, four hundred thirty-nine thousand, two hundred seventy-one".