1181490426181 has 8 divisors (see below), whose sum is σ = 1275396577784. Its totient is φ = 1088016027840.

The previous prime is 1181490426163. The next prime is 1181490426203. The reversal of 1181490426181 is 1816240941811.

It can be written as a sum of positive squares in 4 ways, for example, as 261888062500 + 919602363681 = 511750^2 + 958959^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1181490426181 - 2²⁹ = 1180953555269 is a prime.

It is a super-2 number, since 2×1181490426181² (a number of 25 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 (1181490426881) 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, 107932626 + ... + 107943571.

It is an arithmetic number, because the mean of its divisors is an integer number (159424572223).

Almost surely, 2^{1181490426181} is an apocalyptic number.

It is an amenable number.

1181490426181 is a deficient number, since it is larger than the sum of its proper divisors (93906151603).

1181490426181 is a wasteful number, since it uses less digits than its factorization.

1181490426181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215876631.

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 1181490426181 in words is "one trillion, one hundred eighty-one billion, four hundred ninety million, four hundred twenty-six thousand, one hundred eighty-one".