181232232181 has 16 divisors (see below), whose sum is σ = 243332788608. Its totient is φ = 130356849600.

The previous prime is 181232232173. The next prime is 181232232263.

181232232181 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 181232232181 - 2³ = 181232232173 is a prime.

It is a super-2 number, since 2×181232232181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181232232101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90524590 + ... + 90526591.

It is an arithmetic number, because the mean of its divisors is an integer number (15208299288).

Almost surely, 2^181232232181 is an apocalyptic number.

181232232181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181232232181 is a deficient number, since it is larger than the sum of its proper divisors (62100556427).

181232232181 is a wasteful number, since it uses less digits than its factorization.

181232232181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181051212.

The product of its digits is 9216, while the sum is 34.

The spelling of 181232232181 in words is "one hundred eighty-one billion, two hundred thirty-two million, two hundred thirty-two thousand, one hundred eighty-one".