121667647 has 2 divisors, whose sum is σ = 121667648. Its totient is φ = 121667646.

The previous prime is 121667641. The next prime is 121667669. The reversal of 121667647 is 746766121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121667647 - 2³ = 121667639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121667641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60833823 + 60833824.

It is an arithmetic number, because the mean of its divisors is an integer number (60833824).

Almost surely, 2^121667647 is an apocalyptic number.

121667647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121667647 is an equidigital number, since it uses as much as digits as its factorization.

121667647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 121667647 is about 11030.3058434479. The cubic root of 121667647 is about 495.5167843674.

The spelling of 121667647 in words is "one hundred twenty-one million, six hundred sixty-seven thousand, six hundred forty-seven".