1271887625 has 8 divisors (see below), whose sum is σ = 1587315912. Its totient is φ = 1017510000.

The previous prime is 1271887621. The next prime is 1271887663. The reversal of 1271887625 is 5267881721.

It can be written as a sum of positive squares in 4 ways, for example, as 537289 + 1271350336 = 733^2 + 35656^2 .

It is not a de Polignac number, because 1271887625 - 2² = 1271887621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271887625.

It is not an unprimeable number, because it can be changed into a prime (1271887621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5087426 + ... + 5087675.

It is an arithmetic number, because the mean of its divisors is an integer number (198414489).

Almost surely, 2^1271887625 is an apocalyptic number.

It is an amenable number.

1271887625 is a deficient number, since it is larger than the sum of its proper divisors (315428287).

1271887625 is an equidigital number, since it uses as much as digits as its factorization.

1271887625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10175116 (or 10175106 counting only the distinct ones).

The product of its digits is 376320, while the sum is 47.

The square root of 1271887625 is about 35663.5335461869. The cubic root of 1271887625 is about 1083.4683947323.

The spelling of 1271887625 in words is "one billion, two hundred seventy-one million, eight hundred eighty-seven thousand, six hundred twenty-five".