13661237 has 2 divisors, whose sum is σ = 13661238. Its totient is φ = 13661236.

The previous prime is 13661231. The next prime is 13661261. The reversal of 13661237 is 73216631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10297681 + 3363556 = 3209^2 + 1834^2 .

It is an emirp because it is prime and its reverse (73216631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13661237 - 2¹⁸ = 13399093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13661231) 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, 6830618 + 6830619.

It is an arithmetic number, because the mean of its divisors is an integer number (6830619).

Almost surely, 2^13661237 is an apocalyptic number.

It is an amenable number.

13661237 is a deficient number, since it is larger than the sum of its proper divisors (1).

13661237 is an equidigital number, since it uses as much as digits as its factorization.

13661237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 13661237 is about 3696.1110643486. Note that the first 3 decimals coincide. The cubic root of 13661237 is about 239.0543634322.

Adding to 13661237 its reverse (73216631), we get a palindrome (86877868).

The spelling of 13661237 in words is "thirteen million, six hundred sixty-one thousand, two hundred thirty-seven".