12117947 has 2 divisors, whose sum is σ = 12117948. Its totient is φ = 12117946.

The previous prime is 12117943. The next prime is 12117949. The reversal of 12117947 is 74971121.

It is a strong prime.

It is an emirp because it is prime and its reverse (74971121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12117947 - 2² = 12117943 is a prime.

Together with 12117949, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₇₉₅₂₇₂ and since 12117947 and 795272 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12117943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6058973 + 6058974.

It is an arithmetic number, because the mean of its divisors is an integer number (6058974).

Almost surely, 2^12117947 is an apocalyptic number.

12117947 is a deficient number, since it is larger than the sum of its proper divisors (1).

12117947 is an equidigital number, since it uses as much as digits as its factorization.

12117947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 12117947 is about 3481.0841701976. The cubic root of 12117947 is about 229.6904910558.

The spelling of 12117947 in words is "twelve million, one hundred seventeen thousand, nine hundred forty-seven".