1272647871 has 18 divisors (see below), whose sum is σ = 2020578560. Its totient is φ = 771301080.

The previous prime is 1272647821. The next prime is 1272647899. The reversal of 1272647871 is 1787462721.

It is not a de Polignac number, because 1272647871 - 2⁹ = 1272647359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272647801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 583231 + ... + 585408.

Almost surely, 2^1272647871 is an apocalyptic number.

1272647871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1272647871 is a deficient number, since it is larger than the sum of its proper divisors (747930689).

1272647871 is a wasteful number, since it uses less digits than its factorization.

1272647871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168667 (or 1168653 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 1272647871 is about 35674.1905444258. The cubic root of 1272647871 is about 1083.6842257627.

The spelling of 1272647871 in words is "one billion, two hundred seventy-two million, six hundred forty-seven thousand, eight hundred seventy-one".