191122989 has 8 divisors (see below), whose sum is σ = 257305152. Its totient is φ = 126178080.

The previous prime is 191122969. The next prime is 191123057. The reversal of 191122989 is 989221191.

191122989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 191122989 - 2⁸ = 191122733 is a prime.

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 191122989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191122949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308952 + ... + 309569.

It is an arithmetic number, because the mean of its divisors is an integer number (32163144).

Almost surely, 2^191122989 is an apocalyptic number.

It is an amenable number.

191122989 is a deficient number, since it is larger than the sum of its proper divisors (66182163).

191122989 is a wasteful number, since it uses less digits than its factorization.

191122989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618627.

The product of its digits is 23328, while the sum is 42.

The square root of 191122989 is about 13824.7238308763. The cubic root of 191122989 is about 576.0201062378.

The spelling of 191122989 in words is "one hundred ninety-one million, one hundred twenty-two thousand, nine hundred eighty-nine".