13390661 has 2 divisors, whose sum is σ = 13390662. Its totient is φ = 13390660.

The previous prime is 13390631. The next prime is 13390691. The reversal of 13390661 is 16609331.

It is a balanced prime because it is at equal distance from previous prime (13390631) and next prime (13390691).

It can be written as a sum of positive squares in only one way, i.e., 9060100 + 4330561 = 3010^2 + 2081^2 .

It is an emirp because it is prime and its reverse (16609331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13390661 - 2¹⁸ = 13128517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13390621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695330 + 6695331.

It is an arithmetic number, because the mean of its divisors is an integer number (6695331).

Almost surely, 2^13390661 is an apocalyptic number.

13390661 is the 1637-th centered decagonal number.

It is an amenable number.

13390661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13390661 is an equidigital number, since it uses as much as digits as its factorization.

13390661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 13390661 is about 3659.3252110191. The cubic root of 13390661 is about 237.4655817160.

Adding to 13390661 its reverse (16609331), we get a palindrome (29999992).

The spelling of 13390661 in words is "thirteen million, three hundred ninety thousand, six hundred sixty-one".