191080 has 32 divisors (see below), whose sum is σ = 456840. Its totient is φ = 71680.
The previous prime is 191071. The next prime is 191089. The reversal of 191080 is 80191.
191080 is nontrivially palindromic in base 13.
191080 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 (191071) and next prime (191089).
It can be written as a sum of positive squares in 4 ways, for example, as 181476 + 9604 = 426^2 + 98^2 .
It is not an unprimeable number, because it can be changed into a prime (191089) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540 + ... + 820.
2191080 is an apocalyptic number.
191080 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 191080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228420).
191080 is an abundant number, since it is smaller than the sum of its proper divisors (265760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
191080 is a wasteful number, since it uses less digits than its factorization.
191080 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 309 (or 305 counting only the distinct ones).
The product of its (nonzero) digits is 72, while the sum is 19.
The square root of 191080 is about 437.1269838388. The cubic root of 191080 is about 57.5976915227.
Subtracting from 191080 its reverse (80191), we obtain a square (110889 = 3332).
The spelling of 191080 in words is "one hundred ninety-one thousand, eighty".
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