191311140 has 48 divisors (see below), whose sum is σ = 542465280. Its totient is φ = 50369280.

The previous prime is 191311129. The next prime is 191311151. The reversal of 191311140 is 41113191.

191311140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (191311129) and next prime (191311151).

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, 15441 + ... + 24920.

It is an arithmetic number, because the mean of its divisors is an integer number (11301360).

Almost surely, 2^191311140 is an apocalyptic number.

191311140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191311140 is an abundant number, since it is smaller than the sum of its proper divisors (351154140).

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

191311140 is a wasteful number, since it uses less digits than its factorization.

191311140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40452 (or 40450 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 21.

The square root of 191311140 is about 13831.5270306644. The cubic root of 191311140 is about 576.2090652157.

The spelling of 191311140 in words is "one hundred ninety-one million, three hundred eleven thousand, one hundred forty".