54221987 has 2 divisors, whose sum is σ = 54221988. Its totient is φ = 54221986.

The previous prime is 54221977. The next prime is 54222001. The reversal of 54221987 is 78912245.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54221987 - 2¹⁴ = 54205603 is a prime.

It is a Chen prime.

It is equal to p_3238589 and since 54221987 and 3238589 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 54221987.

It is not a weakly prime, because it can be changed into another prime (54221927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27110993 + 27110994.

It is an arithmetic number, because the mean of its divisors is an integer number (27110994).

Almost surely, 2^54221987 is an apocalyptic number.

54221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

54221987 is an equidigital number, since it uses as much as digits as its factorization.

54221987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 54221987 is about 7363.5580394263. The cubic root of 54221987 is about 378.4935440720.

The spelling of 54221987 in words is "fifty-four million, two hundred twenty-one thousand, nine hundred eighty-seven".