191163890 has 16 divisors (see below), whose sum is σ = 345729600. Its totient is φ = 76102320.

The previous prime is 191163839. The next prime is 191163893. The reversal of 191163890 is 98361191.

It is not an unprimeable number, because it can be changed into a prime (191163893) 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, 43190 + ... + 47409.

It is an arithmetic number, because the mean of its divisors is an integer number (21608100).

Almost surely, 2^191163890 is an apocalyptic number.

191163890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191163890 is a deficient number, since it is larger than the sum of its proper divisors (154565710).

191163890 is a wasteful number, since it uses less digits than its factorization.

191163890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90817.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 191163890 is about 13826.2030217989. The cubic root of 191163890 is about 576.0611934247.

The spelling of 191163890 in words is "one hundred ninety-one million, one hundred sixty-three thousand, eight hundred ninety".