13121331749 has 2 divisors, whose sum is σ = 13121331750. Its totient is φ = 13121331748.

The previous prime is 13121331701. The next prime is 13121331757. The reversal of 13121331749 is 94713312131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7431646849 + 5689684900 = 86207^2 + 75430^2 .

It is an emirp because it is prime and its reverse (94713312131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13121331749 - 2²⁸ = 12852896293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13121331149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560665874 + 6560665875.

It is an arithmetic number, because the mean of its divisors is an integer number (6560665875).

Almost surely, 2^13121331749 is an apocalyptic number.

It is an amenable number.

13121331749 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121331749 is an equidigital number, since it uses as much as digits as its factorization.

13121331749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The spelling of 13121331749 in words is "thirteen billion, one hundred twenty-one million, three hundred thirty-one thousand, seven hundred forty-nine".