191159020 has 96 divisors (see below), whose sum is σ = 459035136. Its totient is φ = 66355200.

The previous prime is 191159009. The next prime is 191159027. The reversal of 191159020 is 20951191.

It is a self number, because there is not a number n which added to its sum of digits gives 191159020.

It is not an unprimeable number, because it can be changed into a prime (191159027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297900 + ... + 298540.

It is an arithmetic number, because the mean of its divisors is an integer number (4781616).

Almost surely, 2^191159020 is an apocalyptic number.

191159020 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 191159020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229517568).

191159020 is an abundant number, since it is smaller than the sum of its proper divisors (267876116).

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

191159020 is a wasteful number, since it uses less digits than its factorization.

191159020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 191159020 is about 13826.0269058034. The cubic root of 191159020 is about 576.0563015632.

The spelling of 191159020 in words is "one hundred ninety-one million, one hundred fifty-nine thousand, twenty".