5671561 has 4 divisors (see below), whose sum is σ = 6481792. Its totient is φ = 4861332.

The previous prime is 5671553. The next prime is 5671573. The reversal of 5671561 is 1651765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5671561 - 2³ = 5671553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5671511) 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, 405105 + ... + 405118.

It is an arithmetic number, because the mean of its divisors is an integer number (1620448).

Almost surely, 2^5671561 is an apocalyptic number.

It is an amenable number.

5671561 is a deficient number, since it is larger than the sum of its proper divisors (810231).

5671561 is an equidigital number, since it uses as much as digits as its factorization.

5671561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810230.

The product of its digits is 6300, while the sum is 31.

The square root of 5671561 is about 2381.5039365913. The cubic root of 5671561 is about 178.3340212122.

It can be divided in two parts, 56 and 71561, that added together give a palindrome (71617).

The spelling of 5671561 in words is "five million, six hundred seventy-one thousand, five hundred sixty-one".