54731221 has 2 divisors, whose sum is σ = 54731222. Its totient is φ = 54731220.

The previous prime is 54731203. The next prime is 54731297. The reversal of 54731221 is 12213745.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40780996 + 13950225 = 6386^2 + 3735^2 .

It is a cyclic number.

It is not a de Polignac number, because 54731221 - 2²¹ = 52634069 is a prime.

It is a super-3 number, since 3×54731221³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54731021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27365610 + 27365611.

It is an arithmetic number, because the mean of its divisors is an integer number (27365611).

Almost surely, 2^54731221 is an apocalyptic number.

It is an amenable number.

54731221 is a deficient number, since it is larger than the sum of its proper divisors (1).

54731221 is an equidigital number, since it uses as much as digits as its factorization.

54731221 is an evil number, because the sum of its binary digits is even.

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

The square root of 54731221 is about 7398.0552174203. The cubic root of 54731221 is about 379.6747470785.

Adding to 54731221 its reverse (12213745), we get a palindrome (66944966).

The spelling of 54731221 in words is "fifty-four million, seven hundred thirty-one thousand, two hundred twenty-one".