5911561 has 4 divisors (see below), whose sum is σ = 5917392. Its totient is φ = 5905732.

The previous prime is 5911559. The next prime is 5911579. The reversal of 5911561 is 1651195.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5911561 - 2¹ = 5911559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5911501) 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, 955 + ... + 3568.

It is an arithmetic number, because the mean of its divisors is an integer number (1479348).

Almost surely, 2^5911561 is an apocalyptic number.

It is an amenable number.

5911561 is a deficient number, since it is larger than the sum of its proper divisors (5831).

5911561 is a wasteful number, since it uses less digits than its factorization.

5911561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830.

The product of its digits is 1350, while the sum is 28.

The square root of 5911561 is about 2431.3701898312. The cubic root of 5911561 is about 180.8148345994.

The spelling of 5911561 in words is "five million, nine hundred eleven thousand, five hundred sixty-one".