1317281856 has 224 divisors, whose sum is σ = 4239889920. Its totient is φ = 355737600.

The previous prime is 1317281851. The next prime is 1317281869. The reversal of 1317281856 is 6581827131.

It is not an unprimeable number, because it can be changed into a prime (1317281851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 681211 + ... + 683141.

It is an arithmetic number, because the mean of its divisors is an integer number (18928080).

Almost surely, 2^1317281856 is an apocalyptic number.

1317281856 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 1317281856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119944960).

1317281856 is an abundant number, since it is smaller than the sum of its proper divisors (2922608064).

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

1317281856 is a wasteful number, since it uses less digits than its factorization.

1317281856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993 (or 1983 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 1317281856 is about 36294.3777464224. The cubic root of 1317281856 is about 1096.2078388231.

The spelling of 1317281856 in words is "one billion, three hundred seventeen million, two hundred eighty-one thousand, eight hundred fifty-six".