13371561 has 36 divisors (see below), whose sum is σ = 23320752. Its totient is φ = 7634088.

The previous prime is 13371551. The next prime is 13371569. The reversal of 13371561 is 16517331.

13371561 is a `hidden beast` number, since 1 + 33 + 71 + 561 = 666.

It is not a de Polignac number, because 13371561 - 2⁷ = 13371433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13371569) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11346 + ... + 12468.

Almost surely, 2^13371561 is an apocalyptic number.

It is an amenable number.

13371561 is a deficient number, since it is larger than the sum of its proper divisors (9949191).

13371561 is an equidigital number, since it uses as much as digits as its factorization.

13371561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 1133 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 13371561 is about 3656.7145089547. The cubic root of 13371561 is about 237.3526236179.

Adding to 13371561 its reverse (16517331), we get a palindrome (29888892).

The spelling of 13371561 in words is "thirteen million, three hundred seventy-one thousand, five hundred sixty-one".