54855721 has 4 divisors (see below), whose sum is σ = 56022912. Its totient is φ = 53688532.

The previous prime is 54855707. The next prime is 54855727. The reversal of 54855721 is 12755845.

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: 12755845 = 5 ⋅2551169.

It is a cyclic number.

It is not a de Polignac number, because 54855721 - 2¹⁵ = 54822953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54855727) 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, 583525 + ... + 583618.

It is an arithmetic number, because the mean of its divisors is an integer number (14005728).

Almost surely, 2^54855721 is an apocalyptic number.

It is an amenable number.

54855721 is a deficient number, since it is larger than the sum of its proper divisors (1167191).

54855721 is a wasteful number, since it uses less digits than its factorization.

54855721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167190.

The product of its digits is 56000, while the sum is 37.

The square root of 54855721 is about 7406.4648112308. The cubic root of 54855721 is about 379.9624177975.

The spelling of 54855721 in words is "fifty-four million, eight hundred fifty-five thousand, seven hundred twenty-one".