1271279025 has 27 divisors (see below), whose sum is σ = 2277960321. Its totient is φ = 677730240.

The previous prime is 1271278991. The next prime is 1271279059. The reversal of 1271279025 is 5209721721.

The square root of 1271279025 is 35655.

It is a perfect power (a square), and thus also a powerful number.

1271279025 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1271278991) and next prime (1271279059).

It can be written as a sum of positive squares in 4 ways, for example, as 76055841 + 1195223184 = 8721^2 + 34572^2 .

It is not a de Polignac number, because 1271279025 - 2²⁷ = 1137061297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 533637 + ... + 536013.

Almost surely, 2^1271279025 is an apocalyptic number.

1271279025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1271279025 is the 35655-th square number.

1271279025 is the 17828-th centered octagonal number.

It is an amenable number.

1271279025 is a deficient number, since it is larger than the sum of its proper divisors (1006681296).

1271279025 is an frugal number, since it uses more digits than its factorization.

1271279025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770 (or 2385 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The cubic root of 1271279025 is about 1083.2955534491.

Multiplying 1271279025 by its sum of digits (36), we get a square (45766044900 = 213930²).

The spelling of 1271279025 in words is "one billion, two hundred seventy-one million, two hundred seventy-nine thousand, twenty-five".