54912721 has 4 divisors (see below), whose sum is σ = 55426032. Its totient is φ = 54399412.

The previous prime is 54912719. The next prime is 54912727. The reversal of 54912721 is 12721945.

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 54912721 - 2¹ = 54912719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54912727) 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, 256495 + ... + 256708.

It is an arithmetic number, because the mean of its divisors is an integer number (13856508).

Almost surely, 2^54912721 is an apocalyptic number.

It is an amenable number.

54912721 is a deficient number, since it is larger than the sum of its proper divisors (513311).

54912721 is a wasteful number, since it uses less digits than its factorization.

54912721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513310.

The product of its digits is 5040, while the sum is 31.

The square root of 54912721 is about 7410.3118018070. The cubic root of 54912721 is about 380.0939772184.

The spelling of 54912721 in words is "fifty-four million, nine hundred twelve thousand, seven hundred twenty-one".