291164 has 12 divisors (see below), whose sum is σ = 516264. Its totient is φ = 143664.

The previous prime is 291143. The next prime is 291167. The reversal of 291164 is 461192.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291164.

It is not an unprimeable number, because it can be changed into a prime (291167) by changing a digit.

291164 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107 + ... + 770.

It is an arithmetic number, because the mean of its divisors is an integer number (43022).

2²⁹¹¹⁶⁴ is an apocalyptic number.

It is an amenable number.

291164 is a deficient number, since it is larger than the sum of its proper divisors (225100).

291164 is a wasteful number, since it uses less digits than its factorization.

291164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 962 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 291164 is about 539.5961452790. The cubic root of 291164 is about 66.2795003305.

The spelling of 291164 in words is "two hundred ninety-one thousand, one hundred sixty-four".