12691849 has 2 divisors, whose sum is σ = 12691850. Its totient is φ = 12691848.

The previous prime is 12691831. The next prime is 12691871. The reversal of 12691849 is 94819621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 53824 = 3555^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 12691849 - 2⁹ = 12691337 is a prime.

It is a super-3 number, since 3×12691849³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (12691649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345924 + 6345925.

It is an arithmetic number, because the mean of its divisors is an integer number (6345925).

Almost surely, 2^12691849 is an apocalyptic number.

It is an amenable number.

12691849 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691849 is an equidigital number, since it uses as much as digits as its factorization.

12691849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 12691849 is about 3562.5621398089. The cubic root of 12691849 is about 233.2607309266.

The spelling of 12691849 in words is "twelve million, six hundred ninety-one thousand, eight hundred forty-nine".