54011561 has 4 divisors (see below), whose sum is σ = 54124800. Its totient is φ = 53898324.

The previous prime is 54011539. The next prime is 54011597. The reversal of 54011561 is 16511045.

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 an emirpimes, since its reverse is a distinct semiprime: 16511045 = 5 ⋅3302209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54011561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54011501) 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, 55901 + ... + 56858.

It is an arithmetic number, because the mean of its divisors is an integer number (13531200).

Almost surely, 2^54011561 is an apocalyptic number.

It is an amenable number.

54011561 is a deficient number, since it is larger than the sum of its proper divisors (113239).

54011561 is a wasteful number, since it uses less digits than its factorization.

54011561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113238.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 54011561 is about 7349.2558126657. The cubic root of 54011561 is about 378.0032870201.

The spelling of 54011561 in words is "fifty-four million, eleven thousand, five hundred sixty-one".