1217183086081 has 4 divisors (see below), whose sum is σ = 1217185763332. Its totient is φ = 1217180408832.

The previous prime is 1217183086061. The next prime is 1217183086103. The reversal of 1217183086081 is 1806803817121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315080142400 + 902102943681 = 561320^2 + 949791^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217183086081 - 2²¹ = 1217180988929 is a prime.

It is a super-2 number, since 2×1217183086081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217183086051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467856 + ... + 1628881.

It is an arithmetic number, because the mean of its divisors is an integer number (304296440833).

Almost surely, 2^{1217183086081} is an apocalyptic number.

It is an amenable number.

1217183086081 is a deficient number, since it is larger than the sum of its proper divisors (2677251).

1217183086081 is an equidigital number, since it uses as much as digits as its factorization.

1217183086081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677250.

The product of its (nonzero) digits is 129024, while the sum is 46.

The spelling of 1217183086081 in words is "one trillion, two hundred seventeen billion, one hundred eighty-three million, eighty-six thousand, eighty-one".