13121017649 has 4 divisors (see below), whose sum is σ = 13287106560. Its totient is φ = 12954928740.

The previous prime is 13121017633. The next prime is 13121017669. The reversal of 13121017649 is 94671012131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13121017649 - 2⁴ = 13121017633 is a prime.

It is a super-2 number, since 2×13121017649² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121017669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83044337 + ... + 83044494.

It is an arithmetic number, because the mean of its divisors is an integer number (3321776640).

Almost surely, 2^13121017649 is an apocalyptic number.

It is an amenable number.

13121017649 is a deficient number, since it is larger than the sum of its proper divisors (166088911).

13121017649 is an equidigital number, since it uses as much as digits as its factorization.

13121017649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166088910.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 13121017649 in words is "thirteen billion, one hundred twenty-one million, seventeen thousand, six hundred forty-nine".