13171661 has 2 divisors, whose sum is σ = 13171662. Its totient is φ = 13171660.

The previous prime is 13171637. The next prime is 13171673. The reversal of 13171661 is 16617131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 348100 = 3581^2 + 590^2 .

It is an emirp because it is prime and its reverse (16617131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13171661 - 2¹⁰ = 13170637 is a prime.

It is a super-3 number, since 3×13171661³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13171661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13171601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6585830 + 6585831.

It is an arithmetic number, because the mean of its divisors is an integer number (6585831).

Almost surely, 2^13171661 is an apocalyptic number.

It is an amenable number.

13171661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13171661 is an equidigital number, since it uses as much as digits as its factorization.

13171661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 26.

The square root of 13171661 is about 3629.2783029137. The cubic root of 13171661 is about 236.1639015135.

Adding to 13171661 its reverse (16617131), we get a palindrome (29788792).

The spelling of 13171661 in words is "thirteen million, one hundred seventy-one thousand, six hundred sixty-one".