161648237 has 2 divisors, whose sum is σ = 161648238. Its totient is φ = 161648236.

The previous prime is 161648213. The next prime is 161648239. The reversal of 161648237 is 732846161.

161648237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161061481 + 586756 = 12691^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 161648237 - 2⁶ = 161648173 is a prime.

It is a super-2 number, since 2×161648237² = 52260305050416338, which contains 22 as substring.

Together with 161648239, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161648237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161648239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80824118 + 80824119.

It is an arithmetic number, because the mean of its divisors is an integer number (80824119).

Almost surely, 2^161648237 is an apocalyptic number.

It is an amenable number.

161648237 is a deficient number, since it is larger than the sum of its proper divisors (1).

161648237 is an equidigital number, since it uses as much as digits as its factorization.

161648237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 161648237 is about 12714.0959961768. The cubic root of 161648237 is about 544.7413266182.

The spelling of 161648237 in words is "one hundred sixty-one million, six hundred forty-eight thousand, two hundred thirty-seven".