291887 has 2 divisors, whose sum is σ = 291888. Its totient is φ = 291886.

The previous prime is 291877. The next prime is 291899. The reversal of 291887 is 788192.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291887 - 2¹⁴ = 275503 is a prime.

It is a Chen prime.

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 291887.

It is not a weakly prime, because it can be changed into another prime (291817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145943 + 145944.

It is an arithmetic number, because the mean of its divisors is an integer number (145944).

2²⁹¹⁸⁸⁷ is an apocalyptic number.

291887 is a deficient number, since it is larger than the sum of its proper divisors (1).

291887 is an equidigital number, since it uses as much as digits as its factorization.

291887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 291887 is about 540.2656753857. The cubic root of 291887 is about 66.3343153366.

The spelling of 291887 in words is "two hundred ninety-one thousand, eight hundred eighty-seven".