12435581989 has 2 divisors, whose sum is σ = 12435581990. Its totient is φ = 12435581988.

The previous prime is 12435581941. The next prime is 12435581993. The reversal of 12435581989 is 98918553421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9451145089 + 2984436900 = 97217^2 + 54630^2 .

It is a cyclic number.

It is not a de Polignac number, because 12435581989 - 2¹¹ = 12435579941 is a prime.

It is a super-2 number, since 2×12435581989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12435581929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6217790994 + 6217790995.

It is an arithmetic number, because the mean of its divisors is an integer number (6217790995).

Almost surely, 2^12435581989 is an apocalyptic number.

It is an amenable number.

12435581989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12435581989 is an equidigital number, since it uses as much as digits as its factorization.

12435581989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 55.

The spelling of 12435581989 in words is "twelve billion, four hundred thirty-five million, five hundred eighty-one thousand, nine hundred eighty-nine".