191164887 has 8 divisors (see below), whose sum is σ = 283207280. Its totient is φ = 127443240.

The previous prime is 191164877. The next prime is 191164889. The reversal of 191164887 is 788461191.

It is a happy number.

It is not a de Polignac number, because 191164887 - 2⁶ = 191164823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191164889) 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 7 ways as a sum of consecutive naturals, for example, 3540064 + ... + 3540117.

It is an arithmetic number, because the mean of its divisors is an integer number (35400910).

Almost surely, 2^191164887 is an apocalyptic number.

191164887 is a deficient number, since it is larger than the sum of its proper divisors (92042393).

191164887 is an equidigital number, since it uses as much as digits as its factorization.

191164887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080190 (or 7080184 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 191164887 is about 13826.2390764806. The cubic root of 191164887 is about 576.0621948900.

The spelling of 191164887 in words is "one hundred ninety-one million, one hundred sixty-four thousand, eight hundred eighty-seven".