13405199749 has 2 divisors, whose sum is σ = 13405199750. Its totient is φ = 13405199748.

The previous prime is 13405199747. The next prime is 13405199761. The reversal of 13405199749 is 94799150431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9176298849 + 4228900900 = 95793^2 + 65030^2 .

It is a cyclic number.

It is not a de Polignac number, because 13405199749 - 2¹ = 13405199747 is a prime.

Together with 13405199747, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13405199696 and 13405199705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13405199747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6702599874 + 6702599875.

It is an arithmetic number, because the mean of its divisors is an integer number (6702599875).

Almost surely, 2^13405199749 is an apocalyptic number.

It is an amenable number.

13405199749 is a deficient number, since it is larger than the sum of its proper divisors (1).

13405199749 is an equidigital number, since it uses as much as digits as its factorization.

13405199749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 13405199749 in words is "thirteen billion, four hundred five million, one hundred ninety-nine thousand, seven hundred forty-nine".