1271247564 has 24 divisors (see below), whose sum is σ = 3014873008. Its totient is φ = 416802240.

The previous prime is 1271247557. The next prime is 1271247569. The reversal of 1271247564 is 4657421721.

It is not an unprimeable number, because it can be changed into a prime (1271247569) 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, 867607 + ... + 869070.

Almost surely, 2^1271247564 is an apocalyptic number.

It is an amenable number.

1271247564 is an abundant number, since it is smaller than the sum of its proper divisors (1743625444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271247564 is a wasteful number, since it uses less digits than its factorization.

1271247564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736745 (or 1736743 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 1271247564 is about 35654.5588109010. The cubic root of 1271247564 is about 1083.2866170835.

The spelling of 1271247564 in words is "one billion, two hundred seventy-one million, two hundred forty-seven thousand, five hundred sixty-four".