161016161 has 4 divisors (see below), whose sum is σ = 162245424. Its totient is φ = 159786900.

The previous prime is 161016157. The next prime is 161016199. The reversal of 161016161 is 161610161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161610161 = 31 ⋅5213231.

It is a cyclic number.

It is not a de Polignac number, because 161016161 - 2² = 161016157 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161016761) 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 in 3 ways as a sum of consecutive naturals, for example, 614435 + ... + 614696.

It is an arithmetic number, because the mean of its divisors is an integer number (40561356).

Almost surely, 2^161016161 is an apocalyptic number.

It is an amenable number.

161016161 is a deficient number, since it is larger than the sum of its proper divisors (1229263).

161016161 is a wasteful number, since it uses less digits than its factorization.

161016161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229262.

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

The square root of 161016161 is about 12689.2143570829. The cubic root of 161016161 is about 544.0303843774.

It can be divided in two parts, 1610 and 16161, that added together give a palindrome (17771).

The spelling of 161016161 in words is "one hundred sixty-one million, sixteen thousand, one hundred sixty-one".