13643512249 has 2 divisors, whose sum is σ = 13643512250. Its totient is φ = 13643512248.

The previous prime is 13643512217. The next prime is 13643512277. The reversal of 13643512249 is 94221534631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12027070224 + 1616442025 = 109668^2 + 40205^2 .

It is a cyclic number.

It is not a de Polignac number, because 13643512249 - 2⁵ = 13643512217 is a prime.

It is a super-2 number, since 2×13643512249² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13643512849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6821756124 + 6821756125.

It is an arithmetic number, because the mean of its divisors is an integer number (6821756125).

Almost surely, 2^13643512249 is an apocalyptic number.

It is an amenable number.

13643512249 is a deficient number, since it is larger than the sum of its proper divisors (1).

13643512249 is an equidigital number, since it uses as much as digits as its factorization.

13643512249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 40.

The spelling of 13643512249 in words is "thirteen billion, six hundred forty-three million, five hundred twelve thousand, two hundred forty-nine".