811280125 has 16 divisors (see below), whose sum is σ = 1013828400. Its totient is φ = 648158400.

The previous prime is 811280087. The next prime is 811280143. The reversal of 811280125 is 521082118.

It can be written as a sum of positive squares in 8 ways, for example, as 397523844 + 413756281 = 19938^2 + 20341^2 .

It is not a de Polignac number, because 811280125 - 2¹⁹ = 810755837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 811280093 and 811280102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99711 + ... + 107539.

It is an arithmetic number, because the mean of its divisors is an integer number (63364275).

Almost surely, 2^811280125 is an apocalyptic number.

It is an amenable number.

811280125 is a deficient number, since it is larger than the sum of its proper divisors (202548275).

811280125 is an equidigital number, since it uses as much as digits as its factorization.

811280125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8673 (or 8663 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 811280125 is about 28482.9795667518. The cubic root of 811280125 is about 932.6605607274.

The spelling of 811280125 in words is "eight hundred eleven million, two hundred eighty thousand, one hundred twenty-five".