54851221 has 4 divisors (see below), whose sum is σ = 55219500. Its totient is φ = 54482944.

The previous prime is 54851177. The next prime is 54851227. The reversal of 54851221 is 12215845.

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 4284900 + 50566321 = 2070^2 + 7111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54851221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54851221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54851227) 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, 183916 + ... + 184213.

It is an arithmetic number, because the mean of its divisors is an integer number (13804875).

Almost surely, 2^54851221 is an apocalyptic number.

It is an amenable number.

54851221 is a deficient number, since it is larger than the sum of its proper divisors (368279).

54851221 is a wasteful number, since it uses less digits than its factorization.

54851221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368278.

The product of its digits is 3200, while the sum is 28.

The square root of 54851221 is about 7406.1610163431. The cubic root of 54851221 is about 379.9520276468.

The spelling of 54851221 in words is "fifty-four million, eight hundred fifty-one thousand, two hundred twenty-one".