161001 has 16 divisors (see below), whose sum is σ = 244800. Its totient is φ = 104544.

The previous prime is 160997. The next prime is 161009. The reversal of 161001 is 100161.

It is not a de Polignac number, because 161001 - 2² = 160997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (161009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1765 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (15300).

2¹⁶¹⁰⁰¹ is an apocalyptic number.

161001 is the 201-st decagonal number.

It is an amenable number.

161001 is a deficient number, since it is larger than the sum of its proper divisors (83799).

161001 is an equidigital number, since it uses as much as digits as its factorization.

161001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 161001 is about 401.2492990648. The cubic root of 161001 is about 54.4013308858.

Adding to 161001 its reverse (100161), we get a palindrome (261162).

The spelling of 161001 in words is "one hundred sixty-one thousand, one".