161020213 has 2 divisors, whose sum is σ = 161020214. Its totient is φ = 161020212.

The previous prime is 161020187. The next prime is 161020259. The reversal of 161020213 is 312020161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148791204 + 12229009 = 12198^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 161020213 - 2⁹ = 161019701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161020273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80510106 + 80510107.

It is an arithmetic number, because the mean of its divisors is an integer number (80510107).

Almost surely, 2^161020213 is an apocalyptic number.

It is an amenable number.

161020213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161020213 is an equidigital number, since it uses as much as digits as its factorization.

161020213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 161020213 is about 12689.3740192336. The cubic root of 161020213 is about 544.0349478792.

Adding to 161020213 its reverse (312020161), we get a palindrome (473040374).

The spelling of 161020213 in words is "one hundred sixty-one million, twenty thousand, two hundred thirteen".