1271791296 has 168 divisors, whose sum is σ = 3888435200. Its totient is φ = 396264960.

The previous prime is 1271791291. The next prime is 1271791307. The reversal of 1271791296 is 6921971721.

1271791296 is a `hidden beast` number, since 1 + 271 + 7 + 91 + 296 = 666.

It is not an unprimeable number, because it can be changed into a prime (1271791291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 863841 + ... + 865311.

Almost surely, 2^1271791296 is an apocalyptic number.

1271791296 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 1271791296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944217600).

1271791296 is an abundant number, since it is smaller than the sum of its proper divisors (2616643904).

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

1271791296 is a wasteful number, since it uses less digits than its factorization.

1271791296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587 (or 1574 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 1271791296 is about 35662.1829954365. The cubic root of 1271791296 is about 1083.4410411464.

The spelling of 1271791296 in words is "one billion, two hundred seventy-one million, seven hundred ninety-one thousand, two hundred ninety-six".