54942721 has 4 divisors (see below), whose sum is σ = 55100500. Its totient is φ = 54784944.

The previous prime is 54942697. The next prime is 54942739. The reversal of 54942721 is 12724945.

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 44289025 + 10653696 = 6655^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 54942721 - 2⁵ = 54942689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54942221) 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, 78366 + ... + 79063.

It is an arithmetic number, because the mean of its divisors is an integer number (13775125).

Almost surely, 2^54942721 is an apocalyptic number.

It is an amenable number.

54942721 is a deficient number, since it is larger than the sum of its proper divisors (157779).

54942721 is a wasteful number, since it uses less digits than its factorization.

54942721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157778.

The product of its digits is 20160, while the sum is 34.

The square root of 54942721 is about 7412.3357317380. The cubic root of 54942721 is about 380.1631824542.

The spelling of 54942721 in words is "fifty-four million, nine hundred forty-two thousand, seven hundred twenty-one".