12399145481 has 2 divisors, whose sum is σ = 12399145482. Its totient is φ = 12399145480.

The previous prime is 12399145469. The next prime is 12399145501. The reversal of 12399145481 is 18454199321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12352099600 + 47045881 = 111140^2 + 6859^2 .

It is an emirp because it is prime and its reverse (18454199321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12399145481 - 2¹⁸ = 12398883337 is a prime.

It is a super-2 number, since 2×12399145481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12399145441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199572740 + 6199572741.

It is an arithmetic number, because the mean of its divisors is an integer number (6199572741).

Almost surely, 2^12399145481 is an apocalyptic number.

It is an amenable number.

12399145481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12399145481 is an equidigital number, since it uses as much as digits as its factorization.

12399145481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The spelling of 12399145481 in words is "twelve billion, three hundred ninety-nine million, one hundred forty-five thousand, four hundred eighty-one".