161000001 has 16 divisors (see below), whose sum is σ = 239293120. Its totient is φ = 106984800.

The previous prime is 160999999. The next prime is 161000009. The reversal of 161000001 is 100000161.

It is not a de Polignac number, because 161000001 - 2¹ = 160999999 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161000009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1075 + ... + 17976.

It is an arithmetic number, because the mean of its divisors is an integer number (14955820).

Almost surely, 2^161000001 is an apocalyptic number.

It is an amenable number.

161000001 is a deficient number, since it is larger than the sum of its proper divisors (78293119).

161000001 is a wasteful number, since it uses less digits than its factorization.

161000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19373 (or 19367 counting only the distinct ones).

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

The square root of 161000001 is about 12688.5775798550. The cubic root of 161000001 is about 544.0121836678.

Adding to 161000001 its reverse (100000161), we get a palindrome (261000162).

The spelling of 161000001 in words is "one hundred sixty-one million, one", and thus it is an aban number.