1281351996 has 36 divisors (see below), whose sum is σ = 3247335000. Its totient is φ = 426014688.

The previous prime is 1281351983. The next prime is 1281351997. The reversal of 1281351996 is 6991531821.

1281351996 is a `hidden beast` number, since 128 + 1 + 3 + 519 + 9 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281351997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31746 + ... + 59753.

It is an arithmetic number, because the mean of its divisors is an integer number (90203750).

Almost surely, 2^1281351996 is an apocalyptic number.

It is an amenable number.

1281351996 is an abundant number, since it is smaller than the sum of its proper divisors (1965983004).

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

1281351996 is a wasteful number, since it uses less digits than its factorization.

1281351996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91898 (or 91893 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1281351996 is about 35795.9773717662. The cubic root of 1281351996 is about 1086.1491914731.

The spelling of 1281351996 in words is "one billion, two hundred eighty-one million, three hundred fifty-one thousand, nine hundred ninety-six".