1275328125 has 56 divisors (see below), whose sum is σ = 2362469760. Its totient is φ = 679950000.

The previous prime is 1275328121. The next prime is 1275328133. The reversal of 1275328125 is 5218235721.

1275328125 is a `hidden beast` number, since 1 + 27 + 532 + 81 + 25 = 666.

It is not a de Polignac number, because 1275328125 - 2² = 1275328121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1275328125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275328121) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 420364 + ... + 423386.

It is an arithmetic number, because the mean of its divisors is an integer number (42186960).

Almost surely, 2^1275328125 is an apocalyptic number.

1275328125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1275328125 is a deficient number, since it is larger than the sum of its proper divisors (1087141635).

1275328125 is an frugal number, since it uses more digits than its factorization.

1275328125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062 (or 3031 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 1275328125 is about 35711.7365161651. The cubic root of 1275328125 is about 1084.4444549909. Note that the first 4 decimals are identical.

The spelling of 1275328125 in words is "one billion, two hundred seventy-five million, three hundred twenty-eight thousand, one hundred twenty-five".