12617947 has 2 divisors, whose sum is σ = 12617948. Its totient is φ = 12617946.

The previous prime is 12617939. The next prime is 12617953. The reversal of 12617947 is 74971621.

12617947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (74971621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12617947 - 2³ = 12617939 is a prime.

It is not a weakly prime, because it can be changed into another prime (12617047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6308973 + 6308974.

It is an arithmetic number, because the mean of its divisors is an integer number (6308974).

Almost surely, 2^12617947 is an apocalyptic number.

12617947 is a deficient number, since it is larger than the sum of its proper divisors (1).

12617947 is an equidigital number, since it uses as much as digits as its factorization.

12617947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 12617947 is about 3552.1749675375. The cubic root of 12617947 is about 232.8071064048.

The spelling of 12617947 in words is "twelve million, six hundred seventeen thousand, nine hundred forty-seven".