54831221 has 2 divisors, whose sum is σ = 54831222. Its totient is φ = 54831220.

The previous prime is 54831197. The next prime is 54831247. The reversal of 54831221 is 12213845.

It is an a-pointer prime, because the next prime (54831247) can be obtained adding 54831221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48804196 + 6027025 = 6986^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 54831221 - 2²² = 50636917 is a prime.

It is a Chen prime.

It is equal to p_3272750 and since 54831221 and 3272750 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54831421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27415610 + 27415611.

It is an arithmetic number, because the mean of its divisors is an integer number (27415611).

Almost surely, 2^54831221 is an apocalyptic number.

It is an amenable number.

54831221 is a deficient number, since it is larger than the sum of its proper divisors (1).

54831221 is an equidigital number, since it uses as much as digits as its factorization.

54831221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 54831221 is about 7404.8106660468. The cubic root of 54831221 is about 379.9058423222.

The spelling of 54831221 in words is "fifty-four million, eight hundred thirty-one thousand, two hundred twenty-one".