121644667 has 4 divisors (see below), whose sum is σ = 121995576. Its totient is φ = 121293760.

The previous prime is 121644659. The next prime is 121644671. The reversal of 121644667 is 766446121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121644667 - 2³ = 121644659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121644617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174934 + ... + 175627.

It is an arithmetic number, because the mean of its divisors is an integer number (30498894).

Almost surely, 2^121644667 is an apocalyptic number.

121644667 is a deficient number, since it is larger than the sum of its proper divisors (350909).

121644667 is an equidigital number, since it uses as much as digits as its factorization.

121644667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350908.

The product of its digits is 48384, while the sum is 37.

The square root of 121644667 is about 11029.2641186980. The cubic root of 121644667 is about 495.4855854607.

The spelling of 121644667 in words is "one hundred twenty-one million, six hundred forty-four thousand, six hundred sixty-seven".