1271951856 has 160 divisors (see below), whose sum is σ = 4274726400. Its totient is φ = 354516480.

The previous prime is 1271951833. The next prime is 1271951869. The reversal of 1271951856 is 6581591721.

1271951856 is a `hidden beast` number, since 12 + 71 + 9 + 518 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118855 + ... + 129113.

It is an arithmetic number, because the mean of its divisors is an integer number (26717040).

Almost surely, 2^1271951856 is an apocalyptic number.

1271951856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271951856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2137363200).

1271951856 is an abundant number, since it is smaller than the sum of its proper divisors (3002774544).

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

1271951856 is a wasteful number, since it uses less digits than its factorization.

1271951856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10324 (or 10312 counting only the distinct ones).

The product of its digits is 151200, while the sum is 45.

The square root of 1271951856 is about 35664.4340485027. The cubic root of 1271951856 is about 1083.4866330015.

The spelling of 1271951856 in words is "one billion, two hundred seventy-one million, nine hundred fifty-one thousand, eight hundred fifty-six".