121029161 has 8 divisors (see below), whose sum is σ = 133124448. Its totient is φ = 110025300.

The previous prime is 121029143. The next prime is 121029163. The reversal of 121029161 is 161920121.

It is a happy number.

It is not a de Polignac number, because 121029161 - 2¹⁰ = 121028137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121029163) 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 7 ways as a sum of consecutive naturals, for example, 44135 + ... + 46796.

It is an arithmetic number, because the mean of its divisors is an integer number (16640556).

Almost surely, 2^121029161 is an apocalyptic number.

121029161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121029161 is a deficient number, since it is larger than the sum of its proper divisors (12095287).

121029161 is an frugal number, since it uses more digits than its factorization.

121029161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90964 (or 90942 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 121029161 is about 11001.3254201482. The cubic root of 121029161 is about 494.6484747025.

Adding to 121029161 its reverse (161920121), we get a palindrome (282949282).

The spelling of 121029161 in words is "one hundred twenty-one million, twenty-nine thousand, one hundred sixty-one".