12913661 has 2 divisors, whose sum is σ = 12913662. Its totient is φ = 12913660.

The previous prime is 12913651. The next prime is 12913679. The reversal of 12913661 is 16631921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7873636 + 5040025 = 2806^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 12913661 - 2¹⁴ = 12897277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12913601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6456830 + 6456831.

It is an arithmetic number, because the mean of its divisors is an integer number (6456831).

Almost surely, 2^12913661 is an apocalyptic number.

It is an amenable number.

12913661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12913661 is an equidigital number, since it uses as much as digits as its factorization.

12913661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 12913661 is about 3593.5582644504. The cubic root of 12913661 is about 234.6117688153.

The spelling of 12913661 in words is "twelve million, nine hundred thirteen thousand, six hundred sixty-one".