191533158 has 12 divisors (see below), whose sum is σ = 414988548. Its totient is φ = 63844380.

The previous prime is 191533123. The next prime is 191533183. The reversal of 191533158 is 851335191.

It is a super-2 number, since 2×191533158² = 73369901226905928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5320348 + ... + 5320383.

It is an arithmetic number, because the mean of its divisors is an integer number (34582379).

Almost surely, 2^191533158 is an apocalyptic number.

191533158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

191533158 is an abundant number, since it is smaller than the sum of its proper divisors (223455390).

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

191533158 is a wasteful number, since it uses less digits than its factorization.

191533158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10640739 (or 10640736 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 191533158 is about 13839.5504984808. The cubic root of 191533158 is about 576.4318773472.

The spelling of 191533158 in words is "one hundred ninety-one million, five hundred thirty-three thousand, one hundred fifty-eight".