54001561 has 4 divisors (see below), whose sum is σ = 54525952. Its totient is φ = 53477172.

The previous prime is 54001529. The next prime is 54001573. The reversal of 54001561 is 16510045.

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 a cyclic number.

It is not a de Polignac number, because 54001561 - 2⁵ = 54001529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54001501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262041 + ... + 262246.

It is an arithmetic number, because the mean of its divisors is an integer number (13631488).

Almost surely, 2^54001561 is an apocalyptic number.

It is an amenable number.

54001561 is a deficient number, since it is larger than the sum of its proper divisors (524391).

54001561 is a wasteful number, since it uses less digits than its factorization.

54001561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524390.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 54001561 is about 7348.5754401789. The cubic root of 54001561 is about 377.9799570385.

The spelling of 54001561 in words is "fifty-four million, one thousand, five hundred sixty-one".