121644161 has 8 divisors (see below), whose sum is σ = 123060264. Its totient is φ = 120234240.

The previous prime is 121644157. The next prime is 121644167. The reversal of 121644161 is 161446121.

It can be written as a sum of positive squares in 4 ways, for example, as 12567025 + 109077136 = 3545^2 + 10444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121644161 - 2² = 121644157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121644161.

It is not an unprimeable number, because it can be changed into a prime (121644167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46295 + ... + 48851.

It is an arithmetic number, because the mean of its divisors is an integer number (15382533).

Almost surely, 2^121644161 is an apocalyptic number.

It is an amenable number.

121644161 is a deficient number, since it is larger than the sum of its proper divisors (1416103).

121644161 is a wasteful number, since it uses less digits than its factorization.

121644161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091.

The product of its digits is 1152, while the sum is 26.

The square root of 121644161 is about 11029.2411797004. The cubic root of 121644161 is about 495.4848984432.

The spelling of 121644161 in words is "one hundred twenty-one million, six hundred forty-four thousand, one hundred sixty-one".