164217187 has 2 divisors, whose sum is σ = 164217188. Its totient is φ = 164217186.

The previous prime is 164217113. The next prime is 164217191. The reversal of 164217187 is 781712461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164217187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164217787) 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 as a sum of consecutive naturals, namely, 82108593 + 82108594.

It is an arithmetic number, because the mean of its divisors is an integer number (82108594).

Almost surely, 2^164217187 is an apocalyptic number.

164217187 is a deficient number, since it is larger than the sum of its proper divisors (1).

164217187 is an equidigital number, since it uses as much as digits as its factorization.

164217187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 37.

The square root of 164217187 is about 12814.7253969798. The cubic root of 164217187 is about 547.6118904225.

The spelling of 164217187 in words is "one hundred sixty-four million, two hundred seventeen thousand, one hundred eighty-seven".