1281071272 has 16 divisors (see below), whose sum is σ = 2586778740. Its totient is φ = 591263616.

The previous prime is 1281071269. The next prime is 1281071287. The reversal of 1281071272 is 2721701821.

It can be written as a sum of positive squares in 2 ways, for example, as 1155048196 + 126023076 = 33986^2 + 11226^2 .

It is a super-2 number, since 2×1281071272² = 3282287207887395968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6158893 + ... + 6159100.

Almost surely, 2^1281071272 is an apocalyptic number.

It is an amenable number.

1281071272 is an abundant number, since it is smaller than the sum of its proper divisors (1305707468).

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

1281071272 is a wasteful number, since it uses less digits than its factorization.

1281071272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12318012 (or 12318008 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 1281071272 is about 35792.0559901216. The cubic root of 1281071272 is about 1086.0698662978.

The spelling of 1281071272 in words is "one billion, two hundred eighty-one million, seventy-one thousand, two hundred seventy-two".