191139841 has 8 divisors (see below), whose sum is σ = 198740520. Its totient is φ = 183606528.

The previous prime is 191139803. The next prime is 191139863. The reversal of 191139841 is 148931191.

It can be written as a sum of positive squares in 4 ways, for example, as 71893441 + 119246400 = 8479^2 + 10920^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 191139841 - 2⁹ = 191139329 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 191139841.

It is not an unprimeable number, because it can be changed into a prime (191139541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11016 + ... + 22441.

It is an arithmetic number, because the mean of its divisors is an integer number (24842565).

Almost surely, 2^191139841 is an apocalyptic number.

It is an amenable number.

191139841 is a deficient number, since it is larger than the sum of its proper divisors (7600679).

191139841 is a wasteful number, since it uses less digits than its factorization.

191139841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33683.

The product of its digits is 7776, while the sum is 37.

The square root of 191139841 is about 13825.3333052046. Note that the first 4 decimals coincide. The cubic root of 191139841 is about 576.0370356604.

The spelling of 191139841 in words is "one hundred ninety-one million, one hundred thirty-nine thousand, eight hundred forty-one".