121607161 has 6 divisors (see below), whose sum is σ = 131681310. Its totient is φ = 112252608.

The previous prime is 121607153. The next prime is 121607207. The reversal of 121607161 is 161706121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1836025 + 119771136 = 1355^2 + 10944^2 .

It is not a de Polignac number, because 121607161 - 2³ = 121607153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121602161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359616 + ... + 359953.

It is an arithmetic number, because the mean of its divisors is an integer number (21946885).

Almost surely, 2^121607161 is an apocalyptic number.

It is an amenable number.

121607161 is a deficient number, since it is larger than the sum of its proper divisors (10074149).

121607161 is an equidigital number, since it uses as much as digits as its factorization.

121607161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719595 (or 719582 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 121607161 is about 11027.5636928562. The cubic root of 121607161 is about 495.4346568200.

It can be divided in two parts, 12160 and 7161, that added together give a square (19321 = 139²).

The spelling of 121607161 in words is "one hundred twenty-one million, six hundred seven thousand, one hundred sixty-one".