121678129 has 8 divisors (see below), whose sum is σ = 129407328. Its totient is φ = 114012480.

The previous prime is 121678127. The next prime is 121678169. The reversal of 121678129 is 921876121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121678129 - 2¹ = 121678127 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121678121) 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 in 7 ways as a sum of consecutive naturals, for example, 11907 + ... + 19624.

It is an arithmetic number, because the mean of its divisors is an integer number (16175916).

Almost surely, 2^121678129 is an apocalyptic number.

It is an amenable number.

121678129 is a deficient number, since it is larger than the sum of its proper divisors (7729199).

121678129 is a wasteful number, since it uses less digits than its factorization.

121678129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31775.

The product of its digits is 12096, while the sum is 37.

The square root of 121678129 is about 11030.7809786977. The cubic root of 121678129 is about 495.5310140001.

The spelling of 121678129 in words is "one hundred twenty-one million, six hundred seventy-eight thousand, one hundred twenty-nine".