161442101 has 4 divisors (see below), whose sum is σ = 167009100. Its totient is φ = 155875104.

The previous prime is 161442089. The next prime is 161442131. The reversal of 161442101 is 101244161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105042001 + 56400100 = 10249^2 + 7510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161442101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161442131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2783456 + ... + 2783513.

It is an arithmetic number, because the mean of its divisors is an integer number (41752275).

Almost surely, 2^161442101 is an apocalyptic number.

It is an amenable number.

161442101 is a deficient number, since it is larger than the sum of its proper divisors (5566999).

161442101 is an equidigital number, since it uses as much as digits as its factorization.

161442101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5566998.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 161442101 is about 12705.9868172449. The cubic root of 161442101 is about 544.5096743061.

Adding to 161442101 its reverse (101244161), we get a palindrome (262686262).

The spelling of 161442101 in words is "one hundred sixty-one million, four hundred forty-two thousand, one hundred one".