191005427 has 2 divisors, whose sum is σ = 191005428. Its totient is φ = 191005426.

The previous prime is 191005417. The next prime is 191005469. The reversal of 191005427 is 724500191.

191005427 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 is a cyclic number.

It is not a de Polignac number, because 191005427 - 2²² = 186811123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191005427.

It is not a weakly prime, because it can be changed into another prime (191005417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95502713 + 95502714.

It is an arithmetic number, because the mean of its divisors is an integer number (95502714).

Almost surely, 2^191005427 is an apocalyptic number.

191005427 is a deficient number, since it is larger than the sum of its proper divisors (1).

191005427 is an equidigital number, since it uses as much as digits as its factorization.

191005427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 191005427 is about 13820.4713016597. The cubic root of 191005427 is about 575.9019764311.

The spelling of 191005427 in words is "one hundred ninety-one million, five thousand, four hundred twenty-seven".