191020073 has 2 divisors, whose sum is σ = 191020074. Its totient is φ = 191020072.

The previous prime is 191020009. The next prime is 191020087. The reversal of 191020073 is 370020191.

191020073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160073104 + 30946969 = 12652^2 + 5563^2 .

It is an emirp because it is prime and its reverse (370020191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191020073 - 2⁶ = 191020009 is a prime.

It is not a weakly prime, because it can be changed into another prime (191020673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95510036 + 95510037.

It is an arithmetic number, because the mean of its divisors is an integer number (95510037).

Almost surely, 2^191020073 is an apocalyptic number.

It is an amenable number.

191020073 is a deficient number, since it is larger than the sum of its proper divisors (1).

191020073 is an equidigital number, since it uses as much as digits as its factorization.

191020073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 191020073 is about 13821.0011576586. The cubic root of 191020073 is about 575.9166958118.

The spelling of 191020073 in words is "one hundred ninety-one million, twenty thousand, seventy-three".