13561297493 has 4 divisors (see below), whose sum is σ = 13571564748. Its totient is φ = 13551030240.

The previous prime is 13561297489. The next prime is 13561297499. The reversal of 13561297493 is 39479216531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39479216531 = 61 ⋅647200271.

It can be written as a sum of positive squares in 2 ways, for example, as 13201550404 + 359747089 = 114898^2 + 18967^2 .

It is a cyclic number.

It is not a de Polignac number, because 13561297493 - 2² = 13561297489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13561297499) 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, 5131646 + ... + 5134287.

It is an arithmetic number, because the mean of its divisors is an integer number (3392891187).

Almost surely, 2^13561297493 is an apocalyptic number.

It is an amenable number.

13561297493 is a deficient number, since it is larger than the sum of its proper divisors (10267255).

13561297493 is a wasteful number, since it uses less digits than its factorization.

13561297493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10267254.

The product of its digits is 1224720, while the sum is 50.

The spelling of 13561297493 in words is "thirteen billion, five hundred sixty-one million, two hundred ninety-seven thousand, four hundred ninety-three".