191273161 has 2 divisors, whose sum is σ = 191273162. Its totient is φ = 191273160.

The previous prime is 191273149. The next prime is 191273189. The reversal of 191273161 is 161372191.

191273161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134119561 + 57153600 = 11581^2 + 7560^2 .

It is an emirp because it is prime and its reverse (161372191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191273161 - 2²³ = 182884553 is a prime.

It is not a weakly prime, because it can be changed into another prime (191273101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95636580 + 95636581.

It is an arithmetic number, because the mean of its divisors is an integer number (95636581).

Almost surely, 2^191273161 is an apocalyptic number.

It is an amenable number.

191273161 is a deficient number, since it is larger than the sum of its proper divisors (1).

191273161 is an equidigital number, since it uses as much as digits as its factorization.

191273161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 31.

The square root of 191273161 is about 13830.1540483105. The cubic root of 191273161 is about 576.1709331056.

The spelling of 191273161 in words is "one hundred ninety-one million, two hundred seventy-three thousand, one hundred sixty-one".