12491917 has 2 divisors, whose sum is σ = 12491918. Its totient is φ = 12491916.

The previous prime is 12491909. The next prime is 12491933. The reversal of 12491917 is 71919421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9036036 + 3455881 = 3006^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 12491917 - 2³ = 12491909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12441917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245958 + 6245959.

It is an arithmetic number, because the mean of its divisors is an integer number (6245959).

Almost surely, 2^12491917 is an apocalyptic number.

It is an amenable number.

12491917 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491917 is an equidigital number, since it uses as much as digits as its factorization.

12491917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 12491917 is about 3534.3906122555. The cubic root of 12491917 is about 232.0294069442.

The spelling of 12491917 in words is "twelve million, four hundred ninety-one thousand, nine hundred seventeen".