161688041 has 8 divisors (see below), whose sum is σ = 166151040. Its totient is φ = 157257072.

The previous prime is 161688029. The next prime is 161688073. The reversal of 161688041 is 140886161.

It is a happy number.

161688041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161688041 - 2²² = 157493737 is a prime.

It is a super-2 number, since 2×161688041² = 52286045204835362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161687992 and 161688010.

It is not an unprimeable number, because it can be changed into a prime (161688011) 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, 2411 + ... + 18143.

It is an arithmetic number, because the mean of its divisors is an integer number (20768880).

Almost surely, 2^161688041 is an apocalyptic number.

It is an amenable number.

161688041 is a deficient number, since it is larger than the sum of its proper divisors (4462999).

161688041 is a wasteful number, since it uses less digits than its factorization.

161688041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16015.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 161688041 is about 12715.6612490267. The cubic root of 161688041 is about 544.7860350227.

The spelling of 161688041 in words is "one hundred sixty-one million, six hundred eighty-eight thousand, forty-one".