12661769 has 2 divisors, whose sum is σ = 12661770. Its totient is φ = 12661768.

The previous prime is 12661741. The next prime is 12661783. The reversal of 12661769 is 96716621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8479744 + 4182025 = 2912^2 + 2045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12661769 is a prime.

It is a super-2 number, since 2×12661769² = 320640788418722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12661739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330884 + 6330885.

It is an arithmetic number, because the mean of its divisors is an integer number (6330885).

Almost surely, 2^12661769 is an apocalyptic number.

It is an amenable number.

12661769 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661769 is an equidigital number, since it uses as much as digits as its factorization.

12661769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 12661769 is about 3558.3379547199. The cubic root of 12661769 is about 233.0763072287.

The spelling of 12661769 in words is "twelve million, six hundred sixty-one thousand, seven hundred sixty-nine".