858281809225 has 81 divisors (see below), whose sum is σ = 1134035653959. Its totient is φ = 644354071200.

The previous prime is 858281809213. The next prime is 858281809249. The reversal of 858281809225 is 522908182858.

The square root of 858281809225 is 926435.

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

858281809225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 308981451321 + 549300357904 = 555861^2 + 741148^2 .

It is not a de Polignac number, because 858281809225 - 2¹¹ = 858281807177 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 858281809225.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 6174689206 + ... + 6174689344.

Almost surely, 2^858281809225 is an apocalyptic number.

858281809225 is the 926435-th square number.

858281809225 is the 463218-th centered octagonal number.

It is an amenable number.

858281809225 is a deficient number, since it is larger than the sum of its proper divisors (275753844734).

858281809225 is an equidigital number, since it uses as much as digits as its factorization.

858281809225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 58.

The spelling of 858281809225 in words is "eight hundred fifty-eight billion, two hundred eighty-one million, eight hundred nine thousand, two hundred twenty-five".