217134139 has 2 divisors, whose sum is σ = 217134140. Its totient is φ = 217134138.

The previous prime is 217134131. The next prime is 217134161. The reversal of 217134139 is 931431712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217134139 - 2³ = 217134131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217134139.

It is not a weakly prime, because it can be changed into another prime (217134131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108567069 + 108567070.

It is an arithmetic number, because the mean of its divisors is an integer number (108567070).

Almost surely, 2^217134139 is an apocalyptic number.

217134139 is a deficient number, since it is larger than the sum of its proper divisors (1).

217134139 is an equidigital number, since it uses as much as digits as its factorization.

217134139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 217134139 is about 14735.4721335965. The cubic root of 217134139 is about 601.0482960959.

It can be divided in two parts, 21713 and 4139, that added together give a palindrome (25852).

The spelling of 217134139 in words is "two hundred seventeen million, one hundred thirty-four thousand, one hundred thirty-nine".