191428093 has 2 divisors, whose sum is σ = 191428094. Its totient is φ = 191428092.

The previous prime is 191428091. The next prime is 191428117. The reversal of 191428093 is 390824191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133333209 + 58094884 = 11547^2 + 7622^2 .

It is a cyclic number.

It is not a de Polignac number, because 191428093 - 2¹ = 191428091 is a prime.

Together with 191428091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191428091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95714046 + 95714047.

It is an arithmetic number, because the mean of its divisors is an integer number (95714047).

Almost surely, 2^191428093 is an apocalyptic number.

It is an amenable number.

191428093 is a deficient number, since it is larger than the sum of its proper divisors (1).

191428093 is an equidigital number, since it uses as much as digits as its factorization.

191428093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 191428093 is about 13835.7541536412. The cubic root of 191428093 is about 576.3264580157.

The spelling of 191428093 in words is "one hundred ninety-one million, four hundred twenty-eight thousand, ninety-three".