285681197 has 4 divisors (see below), whose sum is σ = 285965340. Its totient is φ = 285397056.

The previous prime is 285681191. The next prime is 285681203. The reversal of 285681197 is 791186582.

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

It is an interprime number because it is at equal distance from previous prime (285681191) and next prime (285681203).

It can be written as a sum of positive squares in 2 ways, for example, as 173554276 + 112126921 = 13174^2 + 10589^2 .

It is a cyclic number.

It is not a de Polignac number, because 285681197 - 2¹⁰ = 285680173 is a prime.

It is a super-2 number, since 2×285681197² = 163227492638705618, 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 (285681191) 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, 140558 + ... + 142575.

It is an arithmetic number, because the mean of its divisors is an integer number (71491335).

Almost surely, 2^285681197 is an apocalyptic number.

It is an amenable number.

285681197 is a deficient number, since it is larger than the sum of its proper divisors (284143).

285681197 is a wasteful number, since it uses less digits than its factorization.

285681197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284142.

The product of its digits is 241920, while the sum is 47.

The square root of 285681197 is about 16902.1062888623. The cubic root of 285681197 is about 658.6083294586.

The spelling of 285681197 in words is "two hundred eighty-five million, six hundred eighty-one thousand, one hundred ninety-seven".