11980902181 has 4 divisors (see below), whose sum is σ = 12611476000. Its totient is φ = 11350328364.

The previous prime is 11980902169. The next prime is 11980902187. The reversal of 11980902181 is 18120908911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18120908911 = 7 ⋅2588701273.

It is a cyclic number.

It is not a de Polignac number, because 11980902181 - 2¹¹ = 11980900133 is a prime.

It is a super-2 number, since 2×11980902181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11980902187) 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, 315286881 + ... + 315286918.

It is an arithmetic number, because the mean of its divisors is an integer number (3152869000).

Almost surely, 2^11980902181 is an apocalyptic number.

It is an amenable number.

11980902181 is a deficient number, since it is larger than the sum of its proper divisors (630573819).

11980902181 is an equidigital number, since it uses as much as digits as its factorization.

11980902181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630573818.

The product of its (nonzero) digits is 10368, while the sum is 40.

The spelling of 11980902181 in words is "eleven billion, nine hundred eighty million, nine hundred two thousand, one hundred eighty-one".