291869 has 2 divisors, whose sum is σ = 291870. Its totient is φ = 291868.

The previous prime is 291857. The next prime is 291877. The reversal of 291869 is 968192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235225 + 56644 = 485^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 291869 - 2⁴ = 291853 is a prime.

It is a super-2 number, since 2×291869² = 170375026322, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 3.

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 291869.

It is not a weakly prime, because it can be changed into another prime (291829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145934 + 145935.

It is an arithmetic number, because the mean of its divisors is an integer number (145935).

2²⁹¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

291869 is a deficient number, since it is larger than the sum of its proper divisors (1).

291869 is an equidigital number, since it uses as much as digits as its factorization.

291869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 291869 is about 540.2490166581. The cubic root of 291869 is about 66.3329517471.

The spelling of 291869 in words is "two hundred ninety-one thousand, eight hundred sixty-nine".