191423129 has 2 divisors, whose sum is σ = 191423130. Its totient is φ = 191423128.

The previous prime is 191423123. The next prime is 191423159. The reversal of 191423129 is 921324191.

191423129 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., 125440000 + 65983129 = 11200^2 + 8123^2 .

It is an emirp because it is prime and its reverse (921324191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191423129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191423095 and 191423104.

It is not a weakly prime, because it can be changed into another prime (191423123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95711564 + 95711565.

It is an arithmetic number, because the mean of its divisors is an integer number (95711565).

Almost surely, 2^191423129 is an apocalyptic number.

It is an amenable number.

191423129 is a deficient number, since it is larger than the sum of its proper divisors (1).

191423129 is an equidigital number, since it uses as much as digits as its factorization.

191423129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 191423129 is about 13835.5747621846. The cubic root of 191423129 is about 576.3214763205.

The spelling of 191423129 in words is "one hundred ninety-one million, four hundred twenty-three thousand, one hundred twenty-nine".