1281779303125 has 24 divisors (see below), whose sum is σ = 1626034114656. Its totient is φ = 1010118450000.

The previous prime is 1281779303117. The next prime is 1281779303173. The reversal of 1281779303125 is 5213039771821.

It is not a de Polignac number, because 1281779303125 - 2³ = 1281779303117 is a prime.

It is a super-2 number, since 2×1281779303125² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2851591 + ... + 3270340.

It is an arithmetic number, because the mean of its divisors is an integer number (67751421444).

Almost surely, 2^{1281779303125} is an apocalyptic number.

It is an amenable number.

1281779303125 is a deficient number, since it is larger than the sum of its proper divisors (344254811531).

1281779303125 is an frugal number, since it uses more digits than its factorization.

1281779303125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122023 (or 6122003 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 1281779303125 in words is "one trillion, two hundred eighty-one billion, seven hundred seventy-nine million, three hundred three thousand, one hundred twenty-five".