191020201 has 2 divisors, whose sum is σ = 191020202. Its totient is φ = 191020200.

The previous prime is 191020163. The next prime is 191020217. The reversal of 191020201 is 102020191.

It is an a-pointer prime, because the next prime (191020217) can be obtained adding 191020201 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115347600 + 75672601 = 10740^2 + 8699^2 .

It is a cyclic number.

It is not a de Polignac number, because 191020201 - 2⁷ = 191020073 is a prime.

It is not a weakly prime, because it can be changed into another prime (191020231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95510100 + 95510101.

It is an arithmetic number, because the mean of its divisors is an integer number (95510101).

Almost surely, 2^191020201 is an apocalyptic number.

It is an amenable number.

191020201 is a deficient number, since it is larger than the sum of its proper divisors (1).

191020201 is an equidigital number, since it uses as much as digits as its factorization.

191020201 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 16.

The square root of 191020201 is about 13821.0057882920. The cubic root of 191020201 is about 575.9168244498.

Adding to 191020201 its reverse (102020191), we get a palindrome (293040392).

The spelling of 191020201 in words is "one hundred ninety-one million, twenty thousand, two hundred one".