191686642 has 8 divisors (see below), whose sum is σ = 328605696. Its totient is φ = 82151412.

The previous prime is 191686619. The next prime is 191686681. The reversal of 191686642 is 246686191.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6845938 + ... + 6845965.

It is an arithmetic number, because the mean of its divisors is an integer number (41075712).

Almost surely, 2^191686642 is an apocalyptic number.

191686642 is a deficient number, since it is larger than the sum of its proper divisors (136919054).

191686642 is a wasteful number, since it uses less digits than its factorization.

191686642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13691912.

The product of its digits is 124416, while the sum is 43.

The square root of 191686642 is about 13845.0945103311. The cubic root of 191686642 is about 576.5858096989.

The spelling of 191686642 in words is "one hundred ninety-one million, six hundred eighty-six thousand, six hundred forty-two".