13120347491 has 4 divisors (see below), whose sum is σ = 13120660800. Its totient is φ = 13120034184.

The previous prime is 13120347481. The next prime is 13120347509. The reversal of 13120347491 is 19474302131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19474302131 = 24197 ⋅804823.

It is a cyclic number.

It is not a de Polignac number, because 13120347491 - 2¹⁸ = 13120085347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13120347481) 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, 81971 + ... + 181548.

It is an arithmetic number, because the mean of its divisors is an integer number (3280165200).

Almost surely, 2^13120347491 is an apocalyptic number.

13120347491 is a deficient number, since it is larger than the sum of its proper divisors (313309).

13120347491 is an equidigital number, since it uses as much as digits as its factorization.

13120347491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313308.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 13120347491 in words is "thirteen billion, one hundred twenty million, three hundred forty-seven thousand, four hundred ninety-one".