161895133 has 2 divisors, whose sum is σ = 161895134. Its totient is φ = 161895132.

The previous prime is 161895121. The next prime is 161895163. The reversal of 161895133 is 331598161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110944089 + 50951044 = 10533^2 + 7138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161895133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161895092 and 161895101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161895163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80947566 + 80947567.

It is an arithmetic number, because the mean of its divisors is an integer number (80947567).

Almost surely, 2^161895133 is an apocalyptic number.

It is an amenable number.

161895133 is a deficient number, since it is larger than the sum of its proper divisors (1).

161895133 is an equidigital number, since it uses as much as digits as its factorization.

161895133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 161895133 is about 12723.8018296420. The cubic root of 161895133 is about 545.0185253081.

The spelling of 161895133 in words is "one hundred sixty-one million, eight hundred ninety-five thousand, one hundred thirty-three".