13147217 has 2 divisors, whose sum is σ = 13147218. Its totient is φ = 13147216.

The previous prime is 13147213. The next prime is 13147219. The reversal of 13147217 is 71274131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11587216 + 1560001 = 3404^2 + 1249^2 .

It is a cyclic number.

It is not a de Polignac number, because 13147217 - 2² = 13147213 is a prime.

Together with 13147219, 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 (13147213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6573608 + 6573609.

It is an arithmetic number, because the mean of its divisors is an integer number (6573609).

Almost surely, 2^13147217 is an apocalyptic number.

It is an amenable number.

13147217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13147217 is an equidigital number, since it uses as much as digits as its factorization.

13147217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 13147217 is about 3625.9091273776. The cubic root of 13147217 is about 236.0177198703.

The spelling of 13147217 in words is "thirteen million, one hundred forty-seven thousand, two hundred seventeen".