1281229856997 has 16 divisors (see below), whose sum is σ = 1763494494720. Its totient is φ = 826561771200.

The previous prime is 1281229856957. The next prime is 1281229857053. The reversal of 1281229856997 is 7996589221821.

It is not a de Polignac number, because 1281229856997 - 2¹⁵ = 1281229824229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281229856947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1783047 + ... + 2396187.

It is an arithmetic number, because the mean of its divisors is an integer number (110218405920).

Almost surely, 2^{1281229856997} is an apocalyptic number.

It is an amenable number.

1281229856997 is a deficient number, since it is larger than the sum of its proper divisors (482264637723).

1281229856997 is a wasteful number, since it uses less digits than its factorization.

1281229856997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635644.

The product of its digits is 78382080, while the sum is 69.

The spelling of 1281229856997 in words is "one trillion, two hundred eighty-one billion, two hundred twenty-nine million, eight hundred fifty-six thousand, nine hundred ninety-seven".