217399133 has 12 divisors (see below), whose sum is σ = 253386432. Its totient is φ = 185978520.

The previous prime is 217399123. The next prime is 217399139. The reversal of 217399133 is 331993712.

It is not a de Polignac number, because 217399133 - 2¹² = 217395037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217399139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22748 + ... + 30858.

It is an arithmetic number, because the mean of its divisors is an integer number (21115536).

Almost surely, 2^217399133 is an apocalyptic number.

It is an amenable number.

217399133 is a deficient number, since it is larger than the sum of its proper divisors (35987299).

217399133 is an equidigital number, since it uses as much as digits as its factorization.

217399133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8672 (or 8665 counting only the distinct ones).

The product of its digits is 30618, while the sum is 38.

The square root of 217399133 is about 14744.4610956115. The cubic root of 217399133 is about 601.2927063687.

The spelling of 217399133 in words is "two hundred seventeen million, three hundred ninety-nine thousand, one hundred thirty-three".