12235309981 has 2 divisors, whose sum is σ = 12235309982. Its totient is φ = 12235309980.

The previous prime is 12235309969. The next prime is 12235309991. The reversal of 12235309981 is 18990353221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12234572100 + 737881 = 110610^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 12235309981 - 2⁵ = 12235309949 is a prime.

It is a super-2 number, since 2×12235309981² (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 (12235309991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6117654990 + 6117654991.

It is an arithmetic number, because the mean of its divisors is an integer number (6117654991).

Almost surely, 2^12235309981 is an apocalyptic number.

It is an amenable number.

12235309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12235309981 is an equidigital number, since it uses as much as digits as its factorization.

12235309981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 12235309981 in words is "twelve billion, two hundred thirty-five million, three hundred nine thousand, nine hundred eighty-one".