291169 has 2 divisors, whose sum is σ = 291170. Its totient is φ = 291168.

The previous prime is 291167. The next prime is 291173. The reversal of 291169 is 961192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150544 + 140625 = 388^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 291169 - 2¹ = 291167 is a prime.

It is a super-2 number, since 2×291169² = 169558773122, which contains 22 as substring.

Together with 291167, it forms a pair of twin primes.

291169 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (291167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145584 + 145585.

It is an arithmetic number, because the mean of its divisors is an integer number (145585).

2²⁹¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

291169 is a deficient number, since it is larger than the sum of its proper divisors (1).

291169 is an equidigital number, since it uses as much as digits as its factorization.

291169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 28.

The square root of 291169 is about 539.6007783538. The cubic root of 291169 is about 66.2798797222.

The spelling of 291169 in words is "two hundred ninety-one thousand, one hundred sixty-nine".