13155865249 has 2 divisors, whose sum is σ = 13155865250. Its totient is φ = 13155865248.

The previous prime is 13155865237. The next prime is 13155865291. The reversal of 13155865249 is 94256855131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6854680849 + 6301184400 = 82793^2 + 79380^2 .

It is an emirp because it is prime and its reverse (94256855131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13155865249 - 2¹⁷ = 13155734177 is a prime.

It is not a weakly prime, because it can be changed into another prime (13155865949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6577932624 + 6577932625.

It is an arithmetic number, because the mean of its divisors is an integer number (6577932625).

Almost surely, 2^13155865249 is an apocalyptic number.

It is an amenable number.

13155865249 is a deficient number, since it is larger than the sum of its proper divisors (1).

13155865249 is an equidigital number, since it uses as much as digits as its factorization.

13155865249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 49.

The spelling of 13155865249 in words is "thirteen billion, one hundred fifty-five million, eight hundred sixty-five thousand, two hundred forty-nine".