12430019981 has 4 divisors (see below), whose sum is σ = 12436810464. Its totient is φ = 12423229500.

The previous prime is 12430019951. The next prime is 12430020011. The reversal of 12430019981 is 18991003421.

12430019981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is an interprime number because it is at equal distance from previous prime (12430019951) and next prime (12430020011).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12430019981 is a prime.

It is a super-2 number, since 2×12430019981² (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 (12430019941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3392495 + ... + 3396156.

It is an arithmetic number, because the mean of its divisors is an integer number (3109202616).

Almost surely, 2^12430019981 is an apocalyptic number.

It is an amenable number.

12430019981 is a deficient number, since it is larger than the sum of its proper divisors (6790483).

12430019981 is an equidigital number, since it uses as much as digits as its factorization.

12430019981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790482.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 12430019981 in words is "twelve billion, four hundred thirty million, nineteen thousand, nine hundred eighty-one".