54066391 has 2 divisors, whose sum is σ = 54066392. Its totient is φ = 54066390.

The previous prime is 54066379. The next prime is 54066401. The reversal of 54066391 is 19366045.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54066391 - 2¹⁹ = 53542103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54066371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27033195 + 27033196.

It is an arithmetic number, because the mean of its divisors is an integer number (27033196).

Almost surely, 2^54066391 is an apocalyptic number.

54066391 is a deficient number, since it is larger than the sum of its proper divisors (1).

54066391 is an equidigital number, since it uses as much as digits as its factorization.

54066391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 54066391 is about 7352.9851761036. The cubic root of 54066391 is about 378.1311541561.

The spelling of 54066391 in words is "fifty-four million, sixty-six thousand, three hundred ninety-one".