161516101 has 2 divisors, whose sum is σ = 161516102. Its totient is φ = 161516100.

The previous prime is 161516071. The next prime is 161516123. The reversal of 161516101 is 101615161.

It is an a-pointer prime, because the next prime (161516123) can be obtained adding 161516101 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123988225 + 37527876 = 11135^2 + 6126^2 .

It is a cyclic number.

It is not a de Polignac number, because 161516101 - 2¹¹ = 161514053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161516141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80758050 + 80758051.

It is an arithmetic number, because the mean of its divisors is an integer number (80758051).

Almost surely, 2^161516101 is an apocalyptic number.

It is an amenable number.

161516101 is a deficient number, since it is larger than the sum of its proper divisors (1).

161516101 is an equidigital number, since it uses as much as digits as its factorization.

161516101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 161516101 is about 12708.8984967227. The cubic root of 161516101 is about 544.5928569885.

The spelling of 161516101 in words is "one hundred sixty-one million, five hundred sixteen thousand, one hundred one".