191138357 has 4 divisors (see below), whose sum is σ = 191689536. Its totient is φ = 190587180.

The previous prime is 191138323. The next prime is 191138377. The reversal of 191138357 is 753831191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191138357 - 2¹² = 191134261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191138357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191138317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275069 + ... + 275762.

It is an arithmetic number, because the mean of its divisors is an integer number (47922384).

Almost surely, 2^191138357 is an apocalyptic number.

It is an amenable number.

191138357 is a deficient number, since it is larger than the sum of its proper divisors (551179).

191138357 is an equidigital number, since it uses as much as digits as its factorization.

191138357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551178.

The product of its digits is 22680, while the sum is 38.

The square root of 191138357 is about 13825.2796355083. The cubic root of 191138357 is about 576.0355448824.

The spelling of 191138357 in words is "one hundred ninety-one million, one hundred thirty-eight thousand, three hundred fifty-seven".