191381006 has 4 divisors (see below), whose sum is σ = 287071512. Its totient is φ = 95690502.

The previous prime is 191380993. The next prime is 191381017. The reversal of 191381006 is 600183191.

It is a happy number.

191381006 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 191381006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47845250 + ... + 47845253.

It is an arithmetic number, because the mean of its divisors is an integer number (71767878).

Almost surely, 2^191381006 is an apocalyptic number.

191381006 is a deficient number, since it is larger than the sum of its proper divisors (95690506).

191381006 is an equidigital number, since it uses as much as digits as its factorization.

191381006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95690505.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 191381006 is about 13834.0524070136. The cubic root of 191381006 is about 576.2791996974.

The spelling of 191381006 in words is "one hundred ninety-one million, three hundred eighty-one thousand, six".