191285147 has 4 divisors (see below), whose sum is σ = 193979376. Its totient is φ = 188590920.

The previous prime is 191285063. The next prime is 191285161. The reversal of 191285147 is 741582191.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191285147 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 191285147.

It is not an unprimeable number, because it can be changed into a prime (191285177) by changing a digit.

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, 1347008 + ... + 1347149.

It is an arithmetic number, because the mean of its divisors is an integer number (48494844).

Almost surely, 2^191285147 is an apocalyptic number.

191285147 is a deficient number, since it is larger than the sum of its proper divisors (2694229).

191285147 is an equidigital number, since it uses as much as digits as its factorization.

191285147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694228.

The product of its digits is 20160, while the sum is 38.

The square root of 191285147 is about 13830.5873700288. The cubic root of 191285147 is about 576.1829679715.

The spelling of 191285147 in words is "one hundred ninety-one million, two hundred eighty-five thousand, one hundred forty-seven".