54781999 has 2 divisors, whose sum is σ = 54782000. Its totient is φ = 54781998.

The previous prime is 54781981. The next prime is 54782009. The reversal of 54781999 is 99918745.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54781999 - 2⁹ = 54781487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54781949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27390999 + 27391000.

It is an arithmetic number, because the mean of its divisors is an integer number (27391000).

Almost surely, 2^54781999 is an apocalyptic number.

54781999 is a deficient number, since it is larger than the sum of its proper divisors (1).

54781999 is an equidigital number, since it uses as much as digits as its factorization.

54781999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 54781999 is about 7401.4862696623. The cubic root of 54781999 is about 379.7921277668.

The spelling of 54781999 in words is "fifty-four million, seven hundred eighty-one thousand, nine hundred ninety-nine".