191012201 has 2 divisors, whose sum is σ = 191012202. Its totient is φ = 191012200.

The previous prime is 191012197. The next prime is 191012209. The reversal of 191012201 is 102210191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178195801 + 12816400 = 13349^2 + 3580^2 .

It is an emirp because it is prime and its reverse (102210191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191012201 - 2² = 191012197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191012201.

It is not a weakly prime, because it can be changed into another prime (191012209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95506100 + 95506101.

It is an arithmetic number, because the mean of its divisors is an integer number (95506101).

Almost surely, 2^191012201 is an apocalyptic number.

It is an amenable number.

191012201 is a deficient number, since it is larger than the sum of its proper divisors (1).

191012201 is an equidigital number, since it uses as much as digits as its factorization.

191012201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 191012201 is about 13820.7163707241. The cubic root of 191012201 is about 575.9087844643.

Adding to 191012201 its reverse (102210191), we get a palindrome (293222392).

The spelling of 191012201 in words is "one hundred ninety-one million, twelve thousand, two hundred one".