121918129 has 2 divisors, whose sum is σ = 121918130. Its totient is φ = 121918128.

The previous prime is 121918109. The next prime is 121918157. The reversal of 121918129 is 921819121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71791729 + 50126400 = 8473^2 + 7080^2 .

It is a cyclic number.

It is not a de Polignac number, because 121918129 - 2⁹ = 121917617 is a prime.

It is equal to p_6944614 and since 121918129 and 6944614 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 121918094 and 121918103.

It is not a weakly prime, because it can be changed into another prime (121918109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60959064 + 60959065.

It is an arithmetic number, because the mean of its divisors is an integer number (60959065).

Almost surely, 2^121918129 is an apocalyptic number.

It is an amenable number.

121918129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121918129 is an equidigital number, since it uses as much as digits as its factorization.

121918129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 34.

The square root of 121918129 is about 11041.6542691754. The cubic root of 121918129 is about 495.8565979496.

The spelling of 121918129 in words is "one hundred twenty-one million, nine hundred eighteen thousand, one hundred twenty-nine".