285284981 has 4 divisors (see below), whose sum is σ = 300300000. Its totient is φ = 270269964.

The previous prime is 285284963. The next prime is 285285047. The reversal of 285284981 is 189482582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285284981 is a prime.

It is a super-2 number, since 2×285284981² = 162775040768340722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285284921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7507481 + ... + 7507518.

It is an arithmetic number, because the mean of its divisors is an integer number (75075000).

Almost surely, 2^285284981 is an apocalyptic number.

It is an amenable number.

285284981 is a deficient number, since it is larger than the sum of its proper divisors (15015019).

285284981 is a wasteful number, since it uses less digits than its factorization.

285284981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15015018.

The product of its digits is 368640, while the sum is 47.

The square root of 285284981 is about 16890.3813160035. The cubic root of 285284981 is about 658.3037103087.

The spelling of 285284981 in words is "two hundred eighty-five million, two hundred eighty-four thousand, nine hundred eighty-one".