54171999 has 18 divisors (see below), whose sum is σ = 91024440. Its totient is φ = 30955176.

The previous prime is 54171991. The next prime is 54172003. The reversal of 54171999 is 99917145.

54171999 is a `hidden beast` number, since 541 + 7 + 19 + 99 = 666.

It is not a de Polignac number, because 54171999 - 2³ = 54171991 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54171991) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 60979 + ... + 61860.

Almost surely, 2^54171999 is an apocalyptic number.

54171999 is a deficient number, since it is larger than the sum of its proper divisors (36852441).

54171999 is a wasteful number, since it uses less digits than its factorization.

54171999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122859 (or 122849 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 54171999 is about 7360.1629737391. The cubic root of 54171999 is about 378.3771954986.

The spelling of 54171999 in words is "fifty-four million, one hundred seventy-one thousand, nine hundred ninety-nine".