811252100 has 18 divisors (see below), whose sum is σ = 1760417274. Its totient is φ = 324500800.

The previous prime is 811252081. The next prime is 811252103. The reversal of 811252100 is 1252118.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 255424324 + 555827776 = 15982^2 + 23576^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (811252103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4056161 + ... + 4056360.

Almost surely, 2^811252100 is an apocalyptic number.

It is an amenable number.

811252100 is an abundant number, since it is smaller than the sum of its proper divisors (949165174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811252100 is a wasteful number, since it uses less digits than its factorization.

811252100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8112535 (or 8112528 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 811252100 is about 28482.4876020336. The cubic root of 811252100 is about 932.6498212749.

The spelling of 811252100 in words is "eight hundred eleven million, two hundred fifty-two thousand, one hundred".