12920417 has 2 divisors, whose sum is σ = 12920418. Its totient is φ = 12920416.

The previous prime is 12920407. The next prime is 12920419. The reversal of 12920417 is 71402921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7862416 + 5058001 = 2804^2 + 2249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12920417 is a prime.

Together with 12920419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12920419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460208 + 6460209.

It is an arithmetic number, because the mean of its divisors is an integer number (6460209).

Almost surely, 2^12920417 is an apocalyptic number.

It is an amenable number.

12920417 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920417 is an equidigital number, since it uses as much as digits as its factorization.

12920417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 12920417 is about 3594.4981569059. The cubic root of 12920417 is about 234.6526753865.

The spelling of 12920417 in words is "twelve million, nine hundred twenty thousand, four hundred seventeen".