161012129 has 2 divisors, whose sum is σ = 161012130. Its totient is φ = 161012128.

The previous prime is 161012101. The next prime is 161012221. The reversal of 161012129 is 921210161.

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., 107019025 + 53993104 = 10345^2 + 7348^2 .

It is a cyclic number.

It is not a de Polignac number, because 161012129 - 2¹⁶ = 160946593 is a prime.

It is a super-2 number, since 2×161012129² = 51849811370225282, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (161018129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80506064 + 80506065.

It is an arithmetic number, because the mean of its divisors is an integer number (80506065).

Almost surely, 2^161012129 is an apocalyptic number.

It is an amenable number.

161012129 is a deficient number, since it is larger than the sum of its proper divisors (1).

161012129 is an equidigital number, since it uses as much as digits as its factorization.

161012129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 161012129 is about 12689.0554810041. The cubic root of 161012129 is about 544.0258433242.

The spelling of 161012129 in words is "one hundred sixty-one million, twelve thousand, one hundred twenty-nine".