286861969 has 3 divisors (see below), whose sum is σ = 286878907. Its totient is φ = 286845032.

The previous prime is 286861951. The next prime is 286861973. The reversal of 286861969 is 969168682.

The square root of 286861969 is 16937.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 99500625 + 187361344 = 9975^2 + 13688^2 .

It is not a de Polignac number, because 286861969 - 2⁵ = 286861937 is a prime.

It is a super-2 number, since 2×286861969² = 164579578517113922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (286861979) 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 2 ways as a sum of consecutive naturals, for example, 8469 + ... + 25405.

Almost surely, 2^286861969 is an apocalyptic number.

286861969 is the 16937-th square number.

286861969 is the 8469-th centered octagonal number.

It is an amenable number.

286861969 is a deficient number, since it is larger than the sum of its proper divisors (16938).

286861969 is an frugal number, since it uses more digits than its factorization.

286861969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33874 (or 16937 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The cubic root of 286861969 is about 659.5144646006.

The spelling of 286861969 in words is "two hundred eighty-six million, eight hundred sixty-one thousand, nine hundred sixty-nine".