1271247164 has 48 divisors (see below), whose sum is σ = 2506775040. Its totient is φ = 559109760.

The previous prime is 1271247143. The next prime is 1271247167. The reversal of 1271247164 is 4617421721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271247167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180599 + ... + 187505.

It is an arithmetic number, because the mean of its divisors is an integer number (52224480).

Almost surely, 2^1271247164 is an apocalyptic number.

It is an amenable number.

1271247164 is a deficient number, since it is larger than the sum of its proper divisors (1235527876).

1271247164 is a wasteful number, since it uses less digits than its factorization.

1271247164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7058 (or 7056 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 1271247164 is about 35654.5532015197. The cubic root of 1271247164 is about 1083.2865034642.

Adding to 1271247164 its reverse (4617421721), we get a palindrome (5888668885).

The spelling of 1271247164 in words is "one billion, two hundred seventy-one million, two hundred forty-seven thousand, one hundred sixty-four".