13291561 has 2 divisors, whose sum is σ = 13291562. Its totient is φ = 13291560.

The previous prime is 13291549. The next prime is 13291567. The reversal of 13291561 is 16519231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10208025 + 3083536 = 3195^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 13291561 - 2⁹ = 13291049 is a prime.

It is not a weakly prime, because it can be changed into another prime (13291567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6645780 + 6645781.

It is an arithmetic number, because the mean of its divisors is an integer number (6645781).

Almost surely, 2^13291561 is an apocalyptic number.

It is an amenable number.

13291561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13291561 is an equidigital number, since it uses as much as digits as its factorization.

13291561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 13291561 is about 3645.7593173439. The cubic root of 13291561 is about 236.8783283553.

The spelling of 13291561 in words is "thirteen million, two hundred ninety-one thousand, five hundred sixty-one".