561271 has 4 divisors (see below), whose sum is σ = 566352. Its totient is φ = 556192.

The previous prime is 561251. The next prime is 561277. The reversal of 561271 is 172165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561271 is a prime.

It is a pancake number, because a pancake can be divided into 561271 parts by 1059 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561277) 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, 2371 + ... + 2596.

It is an arithmetic number, because the mean of its divisors is an integer number (141588).

2⁵⁶¹²⁷¹ is an apocalyptic number.

561271 is a deficient number, since it is larger than the sum of its proper divisors (5081).

561271 is a wasteful number, since it uses less digits than its factorization.

561271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080.

The product of its digits is 420, while the sum is 22.

The square root of 561271 is about 749.1802186390. The cubic root of 561271 is about 82.4880178497.

The spelling of 561271 in words is "five hundred sixty-one thousand, two hundred seventy-one".