13471561 has 2 divisors, whose sum is σ = 13471562. Its totient is φ = 13471560.

The previous prime is 13471559. The next prime is 13471607. The reversal of 13471561 is 16517431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13461561 + 10000 = 3669^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 13471561 - 2¹ = 13471559 is a prime.

Together with 13471559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13471501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6735780 + 6735781.

It is an arithmetic number, because the mean of its divisors is an integer number (6735781).

Almost surely, 2^13471561 is an apocalyptic number.

It is an amenable number.

13471561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13471561 is an equidigital number, since it uses as much as digits as its factorization.

13471561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 13471561 is about 3670.3625161556. The cubic root of 13471561 is about 237.9428398851.

Adding to 13471561 its reverse (16517431), we get a palindrome (29988992).

The spelling of 13471561 in words is "thirteen million, four hundred seventy-one thousand, five hundred sixty-one".