13097621681 has 4 divisors (see below), whose sum is σ = 13098444864. Its totient is φ = 13096798500.

The previous prime is 13097621659. The next prime is 13097621687. The reversal of 13097621681 is 18612679031.

13097621681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18612679031 = 31 ⋅600409001.

It is a cyclic number.

It is not a de Polignac number, because 13097621681 - 2²² = 13093427377 is a prime.

It is a super-4 number, since 4×13097621681⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13097621687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387245 + ... + 419706.

It is an arithmetic number, because the mean of its divisors is an integer number (3274611216).

Almost surely, 2^13097621681 is an apocalyptic number.

It is an amenable number.

13097621681 is a deficient number, since it is larger than the sum of its proper divisors (823183).

13097621681 is an equidigital number, since it uses as much as digits as its factorization.

13097621681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823182.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 13097621681 in words is "thirteen billion, ninety-seven million, six hundred twenty-one thousand, six hundred eighty-one".