191481 has 8 divisors (see below), whose sum is σ = 258720. Its totient is φ = 125952.

The previous prime is 191473. The next prime is 191491. The reversal of 191481 is 184191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191481 - 2³ = 191473 is a prime.

It is a super-2 number, since 2×191481² = 73329946722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191441) by changing a digit.

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, 136 + ... + 633.

It is an arithmetic number, because the mean of its divisors is an integer number (32340).

2¹⁹¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

191481 is a deficient number, since it is larger than the sum of its proper divisors (67239).

191481 is an equidigital number, since it uses as much as digits as its factorization.

191481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855.

The product of its digits is 288, while the sum is 24.

The square root of 191481 is about 437.5854202324. The cubic root of 191481 is about 57.6379548265.

The spelling of 191481 in words is "one hundred ninety-one thousand, four hundred eighty-one".