121115129 has 2 divisors, whose sum is σ = 121115130. Its totient is φ = 121115128.

The previous prime is 121115083. The next prime is 121115131. The reversal of 121115129 is 921511121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95511529 + 25603600 = 9773^2 + 5060^2 .

It is a cyclic number.

It is not a de Polignac number, because 121115129 - 2²⁰ = 120066553 is a prime.

Together with 121115131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121115179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60557564 + 60557565.

It is an arithmetic number, because the mean of its divisors is an integer number (60557565).

Almost surely, 2^121115129 is an apocalyptic number.

It is an amenable number.

121115129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121115129 is an equidigital number, since it uses as much as digits as its factorization.

121115129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 23.

The square root of 121115129 is about 11005.2318921502. The cubic root of 121115129 is about 494.7655645986.

The spelling of 121115129 in words is "one hundred twenty-one million, one hundred fifteen thousand, one hundred twenty-nine".