1275821925 has 48 divisors (see below), whose sum is σ = 2428177920. Its totient is φ = 579003840.

The previous prime is 1275821923. The next prime is 1275821927. The reversal of 1275821925 is 5291285721.

It is an interprime number because it is at equal distance from previous prime (1275821923) and next prime (1275821927).

It is not a de Polignac number, because 1275821925 - 2¹ = 1275821923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275821923) 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 47 ways as a sum of consecutive naturals, for example, 64234 + ... + 81716.

It is an arithmetic number, because the mean of its divisors is an integer number (50587040).

Almost surely, 2^1275821925 is an apocalyptic number.

1275821925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1275821925 is a deficient number, since it is larger than the sum of its proper divisors (1152355995).

1275821925 is a wasteful number, since it uses less digits than its factorization.

1275821925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17642 (or 17637 counting only the distinct ones).

The product of its digits is 100800, while the sum is 42.

The square root of 1275821925 is about 35718.6495405411. The cubic root of 1275821925 is about 1084.5844005631.

The spelling of 1275821925 in words is "one billion, two hundred seventy-five million, eight hundred twenty-one thousand, nine hundred twenty-five".