161726161 has 8 divisors (see below), whose sum is σ = 165321000. Its totient is φ = 158151552.

The previous prime is 161726137. The next prime is 161726221. The reversal of 161726161 is 161627161.

It can be written as a sum of positive squares in 4 ways, for example, as 309136 + 161417025 = 556^2 + 12705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161726161 - 2⁵ = 161726129 is a prime.

It is a super-3 number, since 3×161726161³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161726561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11715 + ... + 21463.

It is an arithmetic number, because the mean of its divisors is an integer number (20665125).

Almost surely, 2^161726161 is an apocalyptic number.

It is an amenable number.

161726161 is a deficient number, since it is larger than the sum of its proper divisors (3594839).

161726161 is an equidigital number, since it uses as much as digits as its factorization.

161726161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10115.

The product of its digits is 3024, while the sum is 31.

The square root of 161726161 is about 12717.1600996449. The cubic root of 161726161 is about 544.8288450572.

The spelling of 161726161 in words is "one hundred sixty-one million, seven hundred twenty-six thousand, one hundred sixty-one".