54185921 has 4 divisors (see below), whose sum is σ = 54209412. Its totient is φ = 54162432.

The previous prime is 54185869. The next prime is 54185933. The reversal of 54185921 is 12958145.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32433025 + 21752896 = 5695^2 + 4664^2 .

It is a cyclic number.

It is not a de Polignac number, because 54185921 - 2¹⁴ = 54169537 is a prime.

It is a super-2 number, since 2×54185921² = 5872228069236482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54185951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7856 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (13552353).

Almost surely, 2^54185921 is an apocalyptic number.

It is an amenable number.

54185921 is a deficient number, since it is larger than the sum of its proper divisors (23491).

54185921 is a wasteful number, since it uses less digits than its factorization.

54185921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23490.

The product of its digits is 14400, while the sum is 35.

The square root of 54185921 is about 7361.1086800835. The cubic root of 54185921 is about 378.4096065609.

The spelling of 54185921 in words is "fifty-four million, one hundred eighty-five thousand, nine hundred twenty-one".