13198597649 has 16 divisors (see below), whose sum is σ = 14197384656. Its totient is φ = 12225945600.

The previous prime is 13198597613. The next prime is 13198597723. The reversal of 13198597649 is 94679589131.

It can be written as a sum of positive squares in 8 ways, for example, as 196897024 + 13001700625 = 14032^2 + 114025^2 .

It is a cyclic number.

It is not a de Polignac number, because 13198597649 - 2⁸ = 13198597393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13198597591 and 13198597600.

It is not an unprimeable number, because it can be changed into a prime (13198597609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276359 + ... + 320579.

It is an arithmetic number, because the mean of its divisors is an integer number (887336541).

Almost surely, 2^13198597649 is an apocalyptic number.

It is an amenable number.

13198597649 is a deficient number, since it is larger than the sum of its proper divisors (998787007).

13198597649 is a wasteful number, since it uses less digits than its factorization.

13198597649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44516.

The product of its digits is 14696640, while the sum is 62.

The spelling of 13198597649 in words is "thirteen billion, one hundred ninety-eight million, five hundred ninety-seven thousand, six hundred forty-nine".