865242225 has 81 divisors (see below), whose sum is σ = 1623381123. Its totient is φ = 440519040.

The previous prime is 865242211. The next prime is 865242227. The reversal of 865242225 is 522242568.

The square root of 865242225 is 29415.

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

It can be written as a sum of positive squares in 13 ways, for example, as 50253921 + 814988304 = 7089^2 + 28548^2 .

It is not a de Polignac number, because 865242225 - 2⁷ = 865242097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 865242225.

It is not an unprimeable number, because it can be changed into a prime (865242227) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 16325299 + ... + 16325351.

Almost surely, 2^865242225 is an apocalyptic number.

865242225 is the 29415-th square number.

865242225 is the 14708-th centered octagonal number.

It is an amenable number.

865242225 is a deficient number, since it is larger than the sum of its proper divisors (758138898).

865242225 is a wasteful number, since it uses less digits than its factorization.

865242225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 98 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The cubic root of 865242225 is about 952.8968730748.

Multiplying 865242225 by its sum of digits (36), we get a square (31148720100 = 176490²).

The spelling of 865242225 in words is "eight hundred sixty-five million, two hundred forty-two thousand, two hundred twenty-five".