121655161 has 2 divisors, whose sum is σ = 121655162. Its totient is φ = 121655160.

The previous prime is 121655153. The next prime is 121655189. The reversal of 121655161 is 161556121.

It is a happy number.

It is an a-pointer prime, because the next prime (121655189) can be obtained adding 121655161 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 48038761 = 8580^2 + 6931^2 .

It is a cyclic number.

It is not a de Polignac number, because 121655161 - 2³ = 121655153 is a prime.

It is not a weakly prime, because it can be changed into another prime (121655101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60827580 + 60827581.

It is an arithmetic number, because the mean of its divisors is an integer number (60827581).

Almost surely, 2^121655161 is an apocalyptic number.

It is an amenable number.

121655161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121655161 is an equidigital number, since it uses as much as digits as its factorization.

121655161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 121655161 is about 11029.7398428068. The cubic root of 121655161 is about 495.4998331773.

The spelling of 121655161 in words is "one hundred twenty-one million, six hundred fifty-five thousand, one hundred sixty-one".