1271561012 has 12 divisors (see below), whose sum is σ = 2255714916. Its totient is φ = 627071040.

The previous prime is 1271560993. The next prime is 1271561029. The reversal of 1271561012 is 2101651721.

It can be written as a sum of positive squares in 2 ways, for example, as 820593316 + 450967696 = 28646^2 + 21236^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2177039 + ... + 2177622.

It is an arithmetic number, because the mean of its divisors is an integer number (187976243).

Almost surely, 2^1271561012 is an apocalyptic number.

It is an amenable number.

1271561012 is a deficient number, since it is larger than the sum of its proper divisors (984153904).

1271561012 is a wasteful number, since it uses less digits than its factorization.

1271561012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354738 (or 4354736 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 1271561012 is about 35658.9541630149. The cubic root of 1271561012 is about 1083.3756440963.

The spelling of 1271561012 in words is "one billion, two hundred seventy-one million, five hundred sixty-one thousand, twelve".