53991217 has 8 divisors (see below), whose sum is σ = 64952000. Its totient is φ = 43842384.

The previous prime is 53991209. The next prime is 53991229. The reversal of 53991217 is 71219935.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53991217 - 2³ = 53991209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53991247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202842 + ... + 203107.

It is an arithmetic number, because the mean of its divisors is an integer number (8119000).

Almost surely, 2^53991217 is an apocalyptic number.

It is an amenable number.

53991217 is a deficient number, since it is larger than the sum of its proper divisors (10960783).

53991217 is a wasteful number, since it uses less digits than its factorization.

53991217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405975.

The product of its digits is 17010, while the sum is 37.

The square root of 53991217 is about 7347.8715965918. The cubic root of 53991217 is about 377.9558214748.

The spelling of 53991217 in words is "fifty-three million, nine hundred ninety-one thousand, two hundred seventeen".