161613101 has 16 divisors (see below), whose sum is σ = 186001200. Its totient is φ = 139097088.

The previous prime is 161613097. The next prime is 161613139. The reversal of 161613101 is 101316161.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2979076 + 158634025 = 1726^2 + 12595^2 .

It is not a de Polignac number, because 161613101 - 2² = 161613097 is a prime.

It is a super-2 number, since 2×161613101² = 52237588829672402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161613181) 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, 20735 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (11625075).

Almost surely, 2^161613101 is an apocalyptic number.

It is an amenable number.

161613101 is a deficient number, since it is larger than the sum of its proper divisors (24388099).

161613101 is a wasteful number, since it uses less digits than its factorization.

161613101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6848.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 161613101 is about 12712.7141476555. The cubic root of 161613101 is about 544.7018552769.

Adding to 161613101 its reverse (101316161), we get a palindrome (262929262).

The spelling of 161613101 in words is "one hundred sixty-one million, six hundred thirteen thousand, one hundred one".