12691001 has 2 divisors, whose sum is σ = 12691002. Its totient is φ = 12691000.

The previous prime is 12690991. The next prime is 12691033. The reversal of 12691001 is 10019621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8549776 + 4141225 = 2924^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 12691001 - 2¹⁰ = 12689977 is a prime.

It is a super-2 number, since 2×12691001² = 322123012764002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12691501) 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, 6345500 + 6345501.

It is an arithmetic number, because the mean of its divisors is an integer number (6345501).

Almost surely, 2^12691001 is an apocalyptic number.

It is an amenable number.

12691001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691001 is an equidigital number, since it uses as much as digits as its factorization.

12691001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 12691001 is about 3562.4431223530. The cubic root of 12691001 is about 233.2555357418.

The spelling of 12691001 in words is "twelve million, six hundred ninety-one thousand, one".