20161237 has 2 divisors, whose sum is σ = 20161238. Its totient is φ = 20161236.

The previous prime is 20161199. The next prime is 20161241. The reversal of 20161237 is 73216102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 171396 = 4471^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 20161237 - 2¹⁵ = 20128469 is a prime.

It is equal to p_1280182 and since 20161237 and 1280182 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20161277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080618 + 10080619.

It is an arithmetic number, because the mean of its divisors is an integer number (10080619).

Almost surely, 2^20161237 is an apocalyptic number.

It is an amenable number.

20161237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161237 is an equidigital number, since it uses as much as digits as its factorization.

20161237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20161237 is about 4490.1266129142. The cubic root of 20161237 is about 272.1692510996.

Adding to 20161237 its reverse (73216102), we get a palindrome (93377339).

The spelling of 20161237 in words is "twenty million, one hundred sixty-one thousand, two hundred thirty-seven".