1271557056 has 252 divisors, whose sum is σ = 4305583464. Its totient is φ = 329978880.

The previous prime is 1271557043. The next prime is 1271557073. The reversal of 1271557056 is 6507551721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1137810 + ... + 1138926.

Almost surely, 2^1271557056 is an apocalyptic number.

1271557056 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 1271557056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2152791732).

1271557056 is an abundant number, since it is smaller than the sum of its proper divisors (3034026408).

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

1271557056 is a wasteful number, since it uses less digits than its factorization.

1271557056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 73500, while the sum is 39.

The square root of 1271557056 is about 35658.8986930331. The cubic root of 1271557056 is about 1083.3745205853.

The spelling of 1271557056 in words is "one billion, two hundred seventy-one million, five hundred fifty-seven thousand, fifty-six".