1225186117181 has 4 divisors (see below), whose sum is σ = 1319431203132. Its totient is φ = 1130941031232.

The previous prime is 1225186117159. The next prime is 1225186117189. The reversal of 1225186117181 is 1817116815221.

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 367878640900 + 857307476281 = 606530^2 + 925909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225186117181 - 2³⁰ = 1224112375357 is a prime.

It is a super-2 number, since 2×1225186117181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225186117189) 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, 47122542956 + ... + 47122542981.

It is an arithmetic number, because the mean of its divisors is an integer number (329857800783).

Almost surely, 2^{1225186117181} is an apocalyptic number.

It is an amenable number.

1225186117181 is a deficient number, since it is larger than the sum of its proper divisors (94245085951).

1225186117181 is an equidigital number, since it uses as much as digits as its factorization.

1225186117181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94245085950.

The product of its digits is 53760, while the sum is 44.

The spelling of 1225186117181 in words is "one trillion, two hundred twenty-five billion, one hundred eighty-six million, one hundred seventeen thousand, one hundred eighty-one".