2191336138 has 8 divisors (see below), whose sum is σ = 3289270788. Its totient is φ = 1094912544.

The previous prime is 2191336129. The next prime is 2191336151. The reversal of 2191336138 is 8316331912.

It can be written as a sum of positive squares in 2 ways, for example, as 1706763969 + 484572169 = 41313^2 + 22013^2 .

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 = 2191336097 and 2191336106.

It is an unprimeable number.

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, 374131 + ... + 379942.

Almost surely, 2^2191336138 is an apocalyptic number.

2191336138 is a deficient number, since it is larger than the sum of its proper divisors (1097934650).

2191336138 is a wasteful number, since it uses less digits than its factorization.

2191336138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755528.

The product of its digits is 23328, while the sum is 37.

The square root of 2191336138 is about 46811.7094112146. The cubic root of 2191336138 is about 1298.8819060898.

The spelling of 2191336138 in words is "two billion, one hundred ninety-one million, three hundred thirty-six thousand, one hundred thirty-eight".