1282121825 has 6 divisors (see below), whose sum is σ = 1589831094. Its totient is φ = 1025697440.

The previous prime is 1282121779. The next prime is 1282121831. The reversal of 1282121825 is 5281212821.

It can be written as a sum of positive squares in 3 ways, for example, as 387932416 + 894189409 = 19696^2 + 29903^2 .

It is not a de Polignac number, because 1282121825 - 2¹² = 1282117729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1282121791 and 1282121800.

It is an unprimeable number.

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, 25642412 + ... + 25642461.

It is an arithmetic number, because the mean of its divisors is an integer number (264971849).

Almost surely, 2^1282121825 is an apocalyptic number.

It is an amenable number.

1282121825 is a deficient number, since it is larger than the sum of its proper divisors (307709269).

1282121825 is an equidigital number, since it uses as much as digits as its factorization.

1282121825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51284883 (or 51284878 counting only the distinct ones).

The product of its digits is 5120, while the sum is 32.

The square root of 1282121825 is about 35806.7287670907. The cubic root of 1282121825 is about 1086.3666653479.

The spelling of 1282121825 in words is "one billion, two hundred eighty-two million, one hundred twenty-one thousand, eight hundred twenty-five".