291149 has 4 divisors (see below), whose sum is σ = 292320. Its totient is φ = 289980.

The previous prime is 291143. The next prime is 291167. The reversal of 291149 is 941192.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 291149 - 2¹⁶ = 225613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47 + ... + 764.

It is an arithmetic number, because the mean of its divisors is an integer number (73080).

2²⁹¹¹⁴⁹ is an apocalyptic number.

It is an amenable number.

291149 is a deficient number, since it is larger than the sum of its proper divisors (1171).

291149 is an equidigital number, since it uses as much as digits as its factorization.

291149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its digits is 648, while the sum is 26.

The square root of 291149 is about 539.5822458161. The cubic root of 291149 is about 66.2783621294.

The spelling of 291149 in words is "two hundred ninety-one thousand, one hundred forty-nine".