161055121 has 2 divisors, whose sum is σ = 161055122. Its totient is φ = 161055120.

The previous prime is 161055119. The next prime is 161055133. The reversal of 161055121 is 121550161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98724096 + 62331025 = 9936^2 + 7895^2 .

It is a cyclic number.

It is not a de Polignac number, because 161055121 - 2¹ = 161055119 is a prime.

Together with 161055119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161055092 and 161055101.

It is not a weakly prime, because it can be changed into another prime (161055101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80527560 + 80527561.

It is an arithmetic number, because the mean of its divisors is an integer number (80527561).

Almost surely, 2^161055121 is an apocalyptic number.

It is an amenable number.

161055121 is a deficient number, since it is larger than the sum of its proper divisors (1).

161055121 is an equidigital number, since it uses as much as digits as its factorization.

161055121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 161055121 is about 12690.7494262553. The cubic root of 161055121 is about 544.0742592993.

The spelling of 161055121 in words is "one hundred sixty-one million, fifty-five thousand, one hundred twenty-one".