285134891 has 2 divisors, whose sum is σ = 285134892. Its totient is φ = 285134890.

The previous prime is 285134879. The next prime is 285134917. The reversal of 285134891 is 198431582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285134891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (285134851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142567445 + 142567446.

It is an arithmetic number, because the mean of its divisors is an integer number (142567446).

Almost surely, 2^285134891 is an apocalyptic number.

285134891 is a deficient number, since it is larger than the sum of its proper divisors (1).

285134891 is an equidigital number, since it uses as much as digits as its factorization.

285134891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 285134891 is about 16885.9376701444. The cubic root of 285134891 is about 658.1882443212.

The spelling of 285134891 in words is "two hundred eighty-five million, one hundred thirty-four thousand, eight hundred ninety-one".