285887891 has 2 divisors, whose sum is σ = 285887892. Its totient is φ = 285887890.

The previous prime is 285887879. The next prime is 285887893. The reversal of 285887891 is 198788582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285887891 is a prime.

Together with 285887893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285887893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142943945 + 142943946.

It is an arithmetic number, because the mean of its divisors is an integer number (142943946).

Almost surely, 2^285887891 is an apocalyptic number.

285887891 is a deficient number, since it is larger than the sum of its proper divisors (1).

285887891 is an equidigital number, since it uses as much as digits as its factorization.

285887891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2580480, while the sum is 56.

The square root of 285887891 is about 16908.2196283346. The cubic root of 285887891 is about 658.7671283505.

The spelling of 285887891 in words is "two hundred eighty-five million, eight hundred eighty-seven thousand, eight hundred ninety-one".