866536969 has 3 divisors (see below), whose sum is σ = 866566407. Its totient is φ = 866507532.

The previous prime is 866536961. The next prime is 866536973. The reversal of 866536969 is 969635668.

It is a happy number.

The square root of 866536969 is 29437.

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., 843612025 + 22924944 = 29045^2 + 4788^2 .

It is not a de Polignac number, because 866536969 - 2³ = 866536961 is a prime.

It is a super-2 number, since 2×866536969² = 1501772637287413922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866536961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14719 + ... + 44155.

It is an arithmetic number, because the mean of its divisors is an integer number (288855469).

Almost surely, 2^866536969 is an apocalyptic number.

866536969 is the 29437-th square number.

866536969 is the 14719-th centered octagonal number.

It is an amenable number.

866536969 is a deficient number, since it is larger than the sum of its proper divisors (29438).

866536969 is an frugal number, since it uses more digits than its factorization.

866536969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58874 (or 29437 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 58.

The cubic root of 866536969 is about 953.3719395122.

The spelling of 866536969 in words is "eight hundred sixty-six million, five hundred thirty-six thousand, nine hundred sixty-nine".