13140561 has 16 divisors (see below), whose sum is σ = 20145024. Its totient is φ = 7463424.

The previous prime is 13140557. The next prime is 13140577. The reversal of 13140561 is 16504131.

It is not a de Polignac number, because 13140561 - 2² = 13140557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (13140551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1825 + ... + 5441.

It is an arithmetic number, because the mean of its divisors is an integer number (1259064).

Almost surely, 2^13140561 is an apocalyptic number.

It is an amenable number.

13140561 is a deficient number, since it is larger than the sum of its proper divisors (7004463).

13140561 is a wasteful number, since it uses less digits than its factorization.

13140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 13140561 is about 3624.9911724030. The cubic root of 13140561 is about 235.9778838319.

Adding to 13140561 its reverse (16504131), we get a palindrome (29644692).

The spelling of 13140561 in words is "thirteen million, one hundred forty thousand, five hundred sixty-one".