811716225 has 24 divisors (see below), whose sum is σ = 1343699712. Its totient is φ = 432379200.

The previous prime is 811716211. The next prime is 811716229. The reversal of 811716225 is 522617118.

It is not a de Polignac number, because 811716225 - 2²¹ = 809619073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (811716229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58455 + ... + 70995.

It is an arithmetic number, because the mean of its divisors is an integer number (55987488).

Almost surely, 2^811716225 is an apocalyptic number.

It is an amenable number.

811716225 is a deficient number, since it is larger than the sum of its proper divisors (531983487).

811716225 is a wasteful number, since it uses less digits than its factorization.

811716225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13417 (or 13412 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 811716225 is about 28490.6339873299. The cubic root of 811716225 is about 932.8276466289.

It can be divided in two parts, 8117 and 16225, that added together give a palindrome (24342).

The spelling of 811716225 in words is "eight hundred eleven million, seven hundred sixteen thousand, two hundred twenty-five".