12920317 has 2 divisors, whose sum is σ = 12920318. Its totient is φ = 12920316.

The previous prime is 12920309. The next prime is 12920377. The reversal of 12920317 is 71302921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12916836 + 3481 = 3594^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 12920317 - 2³ = 12920309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12920291 and 12920300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12920377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460158 + 6460159.

It is an arithmetic number, because the mean of its divisors is an integer number (6460159).

Almost surely, 2^12920317 is an apocalyptic number.

It is an amenable number.

12920317 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920317 is an equidigital number, since it uses as much as digits as its factorization.

12920317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12920317 is about 3594.4842467314. The cubic root of 12920317 is about 234.6520700054.

The spelling of 12920317 in words is "twelve million, nine hundred twenty thousand, three hundred seventeen".