191838923 has 2 divisors, whose sum is σ = 191838924. Its totient is φ = 191838922.

The previous prime is 191838869. The next prime is 191838971. The reversal of 191838923 is 329838191.

It is a strong prime.

It is an emirp because it is prime and its reverse (329838191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191838923 - 2¹² = 191834827 is a prime.

It is not a weakly prime, because it can be changed into another prime (191835923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95919461 + 95919462.

It is an arithmetic number, because the mean of its divisors is an integer number (95919462).

Almost surely, 2^191838923 is an apocalyptic number.

191838923 is a deficient number, since it is larger than the sum of its proper divisors (1).

191838923 is an equidigital number, since it uses as much as digits as its factorization.

191838923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 191838923 is about 13850.5928753971. The cubic root of 191838923 is about 576.7384543520.

The spelling of 191838923 in words is "one hundred ninety-one million, eight hundred thirty-eight thousand, nine hundred twenty-three".