1281865283061 has 8 divisors (see below), whose sum is σ = 1864531320864. Its totient is φ = 776888050320.

The previous prime is 1281865283059. The next prime is 1281865283107. The reversal of 1281865283061 is 1603825681821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281865283061 - 2¹ = 1281865283059 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1281865282995 and 1281865283013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281865283011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19422201226 + ... + 19422201291.

It is an arithmetic number, because the mean of its divisors is an integer number (233066415108).

Almost surely, 2^{1281865283061} is an apocalyptic number.

1281865283061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1281865283061 is a deficient number, since it is larger than the sum of its proper divisors (582666037803).

1281865283061 is a wasteful number, since it uses less digits than its factorization.

1281865283061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38844402531.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 1281865283061 in words is "one trillion, two hundred eighty-one billion, eight hundred sixty-five million, two hundred eighty-three thousand, sixty-one".