13561411509 has 24 divisors (see below), whose sum is σ = 20343463712. Its totient is φ = 8698868640.

The previous prime is 13561411463. The next prime is 13561411511. The reversal of 13561411509 is 90511416531.

13561411509 is a `hidden beast` number, since 1 + 3 + 5 + 6 + 141 + 1 + 509 = 666.

It is not a de Polignac number, because 13561411509 - 2¹² = 13561407413 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13561411529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235582 + ... + 287439.

Almost surely, 2^13561411509 is an apocalyptic number.

It is an amenable number.

13561411509 is a deficient number, since it is larger than the sum of its proper divisors (6782052203).

13561411509 is a wasteful number, since it uses less digits than its factorization.

13561411509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523137 (or 523134 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 13561411509 in words is "thirteen billion, five hundred sixty-one million, four hundred eleven thousand, five hundred nine".