191288 has 8 divisors (see below), whose sum is σ = 358680. Its totient is φ = 95640.

The previous prime is 191281. The next prime is 191297. The reversal of 191288 is 882191.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 191288.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 191288.

It is not an unprimeable number, because it can be changed into a prime (191281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11948 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (44835).

2¹⁹¹²⁸⁸ is an apocalyptic number.

It is an amenable number.

191288 is a deficient number, since it is larger than the sum of its proper divisors (167392).

191288 is a wasteful number, since it uses less digits than its factorization.

191288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23917 (or 23913 counting only the distinct ones).

The product of its digits is 1152, while the sum is 29.

The square root of 191288 is about 437.3648362637. The cubic root of 191288 is about 57.6185832529.

The spelling of 191288 in words is "one hundred ninety-one thousand, two hundred eighty-eight".