285001891 has 2 divisors, whose sum is σ = 285001892. Its totient is φ = 285001890.

The previous prime is 285001841. The next prime is 285001903. The reversal of 285001891 is 198100582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285001891 - 2¹⁵ = 284969123 is a prime.

It is not a weakly prime, because it can be changed into another prime (285001841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142500945 + 142500946.

It is an arithmetic number, because the mean of its divisors is an integer number (142500946).

Almost surely, 2^285001891 is an apocalyptic number.

285001891 is a deficient number, since it is larger than the sum of its proper divisors (1).

285001891 is an equidigital number, since it uses as much as digits as its factorization.

285001891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 285001891 is about 16881.9990226276. Note that the first 3 decimals coincide. The cubic root of 285001891 is about 658.0858920036.

The spelling of 285001891 in words is "two hundred eighty-five million, one thousand, eight hundred ninety-one".