12434632181 has 4 divisors (see below), whose sum is σ = 12510918432. Its totient is φ = 12358345932.

The previous prime is 12434632159. The next prime is 12434632187. The reversal of 12434632181 is 18123643421.

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: 18123643421 = 13 ⋅1394126417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12434632181 is a prime.

It is a super-2 number, since 2×12434632181² (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 (12434632187) 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, 38142881 + ... + 38143206.

It is an arithmetic number, because the mean of its divisors is an integer number (3127729608).

Almost surely, 2^12434632181 is an apocalyptic number.

It is an amenable number.

12434632181 is a deficient number, since it is larger than the sum of its proper divisors (76286251).

12434632181 is an equidigital number, since it uses as much as digits as its factorization.

12434632181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76286250.

The product of its digits is 27648, while the sum is 35.

The spelling of 12434632181 in words is "twelve billion, four hundred thirty-four million, six hundred thirty-two thousand, one hundred eighty-one".