191292889 has 12 divisors (see below), whose sum is σ = 196791660. Its totient is φ = 185928000.

The previous prime is 191292887. The next prime is 191292917. The reversal of 191292889 is 988292191.

It can be written as a sum of positive squares in 6 ways, for example, as 3822025 + 187470864 = 1955^2 + 13692^2 .

It is not a de Polignac number, because 191292889 - 2¹ = 191292887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191292883) 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 11 ways as a sum of consecutive naturals, for example, 375567 + ... + 376075.

It is an arithmetic number, because the mean of its divisors is an integer number (16399305).

Almost surely, 2^191292889 is an apocalyptic number.

It is an amenable number.

191292889 is a deficient number, since it is larger than the sum of its proper divisors (5498771).

191292889 is an equidigital number, since it uses as much as digits as its factorization.

191292889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 671 counting only the distinct ones).

The product of its digits is 186624, while the sum is 49.

The square root of 191292889 is about 13830.8672540806. The cubic root of 191292889 is about 576.1907412678.

The spelling of 191292889 in words is "one hundred ninety-one million, two hundred ninety-two thousand, eight hundred eighty-nine".