120509161 has 2 divisors, whose sum is σ = 120509162. Its totient is φ = 120509160.

The previous prime is 120509143. The next prime is 120509219. The reversal of 120509161 is 161905021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77528025 + 42981136 = 8805^2 + 6556^2 .

It is a cyclic number.

It is not a de Polignac number, because 120509161 - 2⁷ = 120509033 is a prime.

It is not a weakly prime, because it can be changed into another prime (120509861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60254580 + 60254581.

It is an arithmetic number, because the mean of its divisors is an integer number (60254581).

Almost surely, 2^120509161 is an apocalyptic number.

It is an amenable number.

120509161 is a deficient number, since it is larger than the sum of its proper divisors (1).

120509161 is an equidigital number, since it uses as much as digits as its factorization.

120509161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 120509161 is about 10977.6664642355. Note that the first 3 decimals coincide. The cubic root of 120509161 is about 493.9390410884.

The spelling of 120509161 in words is "one hundred twenty million, five hundred nine thousand, one hundred sixty-one".