121200161 has 4 divisors (see below), whose sum is σ = 121222212. Its totient is φ = 121178112.

The previous prime is 121200151. The next prime is 121200181. The reversal of 121200161 is 161002121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 59969536 + 61230625 = 7744^2 + 7825^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200161 - 2⁶ = 121200097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200151) 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, 4625 + ... + 16241.

It is an arithmetic number, because the mean of its divisors is an integer number (30305553).

Almost surely, 2^121200161 is an apocalyptic number.

It is an amenable number.

121200161 is a deficient number, since it is larger than the sum of its proper divisors (22051).

121200161 is a wasteful number, since it uses less digits than its factorization.

121200161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22050.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 121200161 is about 11009.0944677571. The cubic root of 121200161 is about 494.8813251537.

Adding to 121200161 its reverse (161002121), we get a palindrome (282202282).

The spelling of 121200161 in words is "one hundred twenty-one million, two hundred thousand, one hundred sixty-one".