811287511225 has 27 divisors (see below), whose sum is σ = 1013552445549. Its totient is φ = 644191368000.

The previous prime is 811287511213. The next prime is 811287511253. The reversal of 811287511225 is 522115782118.

The square root of 811287511225 is 900715.

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

It can be written as a sum of positive squares in 4 ways, for example, as 13274035369 + 798013475856 = 115213^2 + 893316^2 .

It is not a de Polignac number, because 811287511225 - 2¹⁵ = 811287478457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 680039229 + ... + 680040421.

Almost surely, 2^811287511225 is an apocalyptic number.

811287511225 is the 900715-th square number.

811287511225 is the 450358-th centered octagonal number.

It is an amenable number.

811287511225 is a deficient number, since it is larger than the sum of its proper divisors (202264934324).

811287511225 is an frugal number, since it uses more digits than its factorization.

811287511225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698 (or 1349 counting only the distinct ones).

The product of its digits is 89600, while the sum is 43.

The spelling of 811287511225 in words is "eight hundred eleven billion, two hundred eighty-seven million, five hundred eleven thousand, two hundred twenty-five".