191311040 has 56 divisors (see below), whose sum is σ = 463326480. Its totient is φ = 75219968.

The previous prime is 191311039. The next prime is 191311093. The reversal of 191311040 is 40113191.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 7 ways as a sum of consecutive naturals, for example, 13814 + ... + 23946.

Almost surely, 2^191311040 is an apocalyptic number.

191311040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191311040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231663240).

191311040 is an abundant number, since it is smaller than the sum of its proper divisors (272015440).

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

191311040 is a wasteful number, since it uses less digits than its factorization.

191311040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209 (or 10199 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 191311040 is about 13831.5234157341. The cubic root of 191311040 is about 576.2089648192.

The spelling of 191311040 in words is "one hundred ninety-one million, three hundred eleven thousand, forty".