54312721 has 4 divisors (see below), whose sum is σ = 54703600. Its totient is φ = 53921844.

The previous prime is 54312719. The next prime is 54312733. The reversal of 54312721 is 12721345.

It is a happy number.

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 54312721 - 2¹ = 54312719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54312761) 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, 195231 + ... + 195508.

It is an arithmetic number, because the mean of its divisors is an integer number (13675900).

Almost surely, 2^54312721 is an apocalyptic number.

It is an amenable number.

54312721 is a deficient number, since it is larger than the sum of its proper divisors (390879).

54312721 is a wasteful number, since it uses less digits than its factorization.

54312721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390878.

The product of its digits is 1680, while the sum is 25.

The square root of 54312721 is about 7369.7164802996. The cubic root of 54312721 is about 378.7045476214.

The spelling of 54312721 in words is "fifty-four million, three hundred twelve thousand, seven hundred twenty-one".