217199139 has 8 divisors (see below), whose sum is σ = 297426000. Its totient is φ = 140885856.

The previous prime is 217199117. The next prime is 217199159. The reversal of 217199139 is 931991712.

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

It is not a de Polignac number, because 217199139 - 2⁵ = 217199107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217199139.

It is not an unprimeable number, because it can be changed into a prime (217199159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 978264 + ... + 978485.

It is an arithmetic number, because the mean of its divisors is an integer number (37178250).

Almost surely, 2^217199139 is an apocalyptic number.

217199139 is a deficient number, since it is larger than the sum of its proper divisors (80226861).

217199139 is a wasteful number, since it uses less digits than its factorization.

217199139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956789.

The product of its digits is 30618, while the sum is 42.

The square root of 217199139 is about 14737.6775307373. The cubic root of 217199139 is about 601.1082655410.

The spelling of 217199139 in words is "two hundred seventeen million, one hundred ninety-nine thousand, one hundred thirty-nine".