5891561 has 4 divisors (see below), whose sum is σ = 6344772. Its totient is φ = 5438352.

The previous prime is 5891531. The next prime is 5891569. The reversal of 5891561 is 1651985.

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 1243225 + 4648336 = 1115^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 5891561 - 2¹⁰ = 5890537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5891569) 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, 226586 + ... + 226611.

It is an arithmetic number, because the mean of its divisors is an integer number (1586193).

Almost surely, 2^5891561 is an apocalyptic number.

It is an amenable number.

5891561 is a deficient number, since it is larger than the sum of its proper divisors (453211).

5891561 is a wasteful number, since it uses less digits than its factorization.

5891561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453210.

The product of its digits is 10800, while the sum is 35.

The square root of 5891561 is about 2427.2537980195. The cubic root of 5891561 is about 180.6106932231.

It can be divided in two parts, 58 and 91561, that added together give a palindrome (91619).

The spelling of 5891561 in words is "five million, eight hundred ninety-one thousand, five hundred sixty-one".