121232161 has 4 divisors (see below), whose sum is σ = 121264452. Its totient is φ = 121199872.

The previous prime is 121232159. The next prime is 121232173. The reversal of 121232161 is 161232121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61324561 + 59907600 = 7831^2 + 7740^2 .

It is a cyclic number.

It is not a de Polignac number, because 121232161 - 2¹ = 121232159 is a prime.

It is a super-3 number, since 3×121232161³ (a number of 25 digits) contains 333 as substring.

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 (121232101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9640 + ... + 18313.

It is an arithmetic number, because the mean of its divisors is an integer number (30316113).

Almost surely, 2^121232161 is an apocalyptic number.

It is an amenable number.

121232161 is a deficient number, since it is larger than the sum of its proper divisors (32291).

121232161 is an equidigital number, since it uses as much as digits as its factorization.

121232161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32290.

The product of its digits is 144, while the sum is 19.

The square root of 121232161 is about 11010.5477157133. The cubic root of 121232161 is about 494.9248751753.

Adding to 121232161 its reverse (161232121), we get a palindrome (282464282).

The spelling of 121232161 in words is "one hundred twenty-one million, two hundred thirty-two thousand, one hundred sixty-one".