191837138 has 8 divisors (see below), whose sum is σ = 291697788. Its totient is φ = 94604544.

The previous prime is 191837123. The next prime is 191837159. The reversal of 191837138 is 831738191.

It can be written as a sum of positive squares in 2 ways, for example, as 187498249 + 4338889 = 13693^2 + 2083^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 191837095 and 191837104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656831 + ... + 657122.

Almost surely, 2^191837138 is an apocalyptic number.

191837138 is a deficient number, since it is larger than the sum of its proper divisors (99860650).

191837138 is a wasteful number, since it uses less digits than its factorization.

191837138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314028.

The product of its digits is 36288, while the sum is 41.

The square root of 191837138 is about 13850.5284375723. The cubic root of 191837138 is about 576.7366655573.

The spelling of 191837138 in words is "one hundred ninety-one million, eight hundred thirty-seven thousand, one hundred thirty-eight".