191478923 has 2 divisors, whose sum is σ = 191478924. Its totient is φ = 191478922.

The previous prime is 191478907. The next prime is 191478929. The reversal of 191478923 is 329874191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191478923 - 2⁴ = 191478907 is a prime.

It is not a weakly prime, because it can be changed into another prime (191478929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95739461 + 95739462.

It is an arithmetic number, because the mean of its divisors is an integer number (95739462).

Almost surely, 2^191478923 is an apocalyptic number.

191478923 is a deficient number, since it is larger than the sum of its proper divisors (1).

191478923 is an equidigital number, since it uses as much as digits as its factorization.

191478923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 191478923 is about 13837.5909391772. The cubic root of 191478923 is about 576.3774642551.

The spelling of 191478923 in words is "one hundred ninety-one million, four hundred seventy-eight thousand, nine hundred twenty-three".