285004981 has 4 divisors (see below), whose sum is σ = 291956364. Its totient is φ = 278053600.

The previous prime is 285004961. The next prime is 285004991. The reversal of 285004981 is 189400582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99800100 + 185204881 = 9990^2 + 13609^2 .

It is a cyclic number.

It is not a de Polignac number, because 285004981 - 2¹⁵ = 284972213 is a prime.

It is a super-2 number, since 2×285004981² = 162455678389620722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285004981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285004961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3475630 + ... + 3475711.

It is an arithmetic number, because the mean of its divisors is an integer number (72989091).

Almost surely, 2^285004981 is an apocalyptic number.

It is an amenable number.

285004981 is a deficient number, since it is larger than the sum of its proper divisors (6951383).

285004981 is an equidigital number, since it uses as much as digits as its factorization.

285004981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951382.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 285004981 is about 16882.0905399776. The cubic root of 285004981 is about 658.0882703247.

The spelling of 285004981 in words is "two hundred eighty-five million, four thousand, nine hundred eighty-one".