191080129 has 2 divisors, whose sum is σ = 191080130. Its totient is φ = 191080128.

The previous prime is 191080117. The next prime is 191080139. The reversal of 191080129 is 921080191.

191080129 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., 172975104 + 18105025 = 13152^2 + 4255^2 .

It is an emirp because it is prime and its reverse (921080191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191080129 - 2²¹ = 188982977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191080129.

It is not a weakly prime, because it can be changed into another prime (191080139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95540064 + 95540065.

It is an arithmetic number, because the mean of its divisors is an integer number (95540065).

Almost surely, 2^191080129 is an apocalyptic number.

It is an amenable number.

191080129 is a deficient number, since it is larger than the sum of its proper divisors (1).

191080129 is an equidigital number, since it uses as much as digits as its factorization.

191080129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 191080129 is about 13823.1736225803. The cubic root of 191080129 is about 575.9770448430.

The spelling of 191080129 in words is "one hundred ninety-one million, eighty thousand, one hundred twenty-nine".