811129925 has 24 divisors (see below), whose sum is σ = 1072197000. Its totient is φ = 606586880.

The previous prime is 811129909. The next prime is 811129927. The reversal of 811129925 is 529921118.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 336282244 + 474847681 = 18338^2 + 21791^2 .

It is not a de Polignac number, because 811129925 - 2⁴ = 811129909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811129927) 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 23 ways as a sum of consecutive naturals, for example, 56921 + ... + 69729.

It is an arithmetic number, because the mean of its divisors is an integer number (44674875).

Almost surely, 2^811129925 is an apocalyptic number.

811129925 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

811129925 is a deficient number, since it is larger than the sum of its proper divisors (261067075).

811129925 is a wasteful number, since it uses less digits than its factorization.

811129925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12985 (or 12980 counting only the distinct ones).

The product of its digits is 12960, while the sum is 38.

The square root of 811129925 is about 28480.3427823473. The cubic root of 811129925 is about 932.6029997371.

The spelling of 811129925 in words is "eight hundred eleven million, one hundred twenty-nine thousand, nine hundred twenty-five".