191491330 has 32 divisors (see below), whose sum is σ = 362029824. Its totient is φ = 72785856.

The previous prime is 191491327. The next prime is 191491381. The reversal of 191491330 is 33194191.

191491330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191491292 and 191491301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33459 + ... + 38761.

It is an arithmetic number, because the mean of its divisors is an integer number (11313432).

Almost surely, 2^191491330 is an apocalyptic number.

191491330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191491330 is a deficient number, since it is larger than the sum of its proper divisors (170538494).

191491330 is a wasteful number, since it uses less digits than its factorization.

191491330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5490.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 191491330 is about 13838.0392397189. The cubic root of 191491330 is about 576.3899129024.

The spelling of 191491330 in words is "one hundred ninety-one million, four hundred ninety-one thousand, three hundred thirty".