291138 has 8 divisors (see below), whose sum is σ = 582288. Its totient is φ = 97044.

The previous prime is 291113. The next prime is 291143. The reversal of 291138 is 831192.

291138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

291138 is an admirable number.

It is a super-2 number, since 2×291138² = 169522670088, which contains 22 as substring.

It is an unprimeable number.

291138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24256 + ... + 24267.

It is an arithmetic number, because the mean of its divisors is an integer number (72786).

2²⁹¹¹³⁸ is an apocalyptic number.

291138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

291138 is a wasteful number, since it uses less digits than its factorization.

291138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48528.

The product of its digits is 432, while the sum is 24.

The square root of 291138 is about 539.5720526491. The cubic root of 291138 is about 66.2775274237.

The spelling of 291138 in words is "two hundred ninety-one thousand, one hundred thirty-eight".