128132191 has 8 divisors (see below), whose sum is σ = 140085504. Its totient is φ = 116229720.

The previous prime is 128132183. The next prime is 128132197. The reversal of 128132191 is 191231821.

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

It is a cyclic number.

It is not a de Polignac number, because 128132191 - 2³ = 128132183 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 (128132197) 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, 7335 + ... + 17608.

It is an arithmetic number, because the mean of its divisors is an integer number (17510688).

Almost surely, 2^128132191 is an apocalyptic number.

128132191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128132191 is a deficient number, since it is larger than the sum of its proper divisors (11953313).

128132191 is a wasteful number, since it uses less digits than its factorization.

128132191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25421.

The product of its digits is 864, while the sum is 28.

The square root of 128132191 is about 11319.5490634565. The cubic root of 128132191 is about 504.1418500849.

The spelling of 128132191 in words is "one hundred twenty-eight million, one hundred thirty-two thousand, one hundred ninety-one".