191330538 has 16 divisors (see below), whose sum is σ = 437327040. Its totient is φ = 54665856.

The previous prime is 191330507. The next prime is 191330539. The reversal of 191330538 is 835033191.

It is a junction number, because it is equal to n+sod(n) for n = 191330499 and 191330508.

It is not an unprimeable number, because it can be changed into a prime (191330539) 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, 2277703 + ... + 2277786.

It is an arithmetic number, because the mean of its divisors is an integer number (27332940).

Almost surely, 2^191330538 is an apocalyptic number.

191330538 is an abundant number, since it is smaller than the sum of its proper divisors (245996502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191330538 is a wasteful number, since it uses less digits than its factorization.

191330538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555501.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 191330538 is about 13832.2282369834. The cubic root of 191330538 is about 576.2285394705.

The spelling of 191330538 in words is "one hundred ninety-one million, three hundred thirty thousand, five hundred thirty-eight".