165121237 has 2 divisors, whose sum is σ = 165121238. Its totient is φ = 165121236.

The previous prime is 165121213. The next prime is 165121261. The reversal of 165121237 is 732121561.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (165121213) and next prime (165121261).

It can be written as a sum of positive squares in only one way, i.e., 110376036 + 54745201 = 10506^2 + 7399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165121237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165121207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82560618 + 82560619.

It is an arithmetic number, because the mean of its divisors is an integer number (82560619).

Almost surely, 2^165121237 is an apocalyptic number.

It is an amenable number.

165121237 is a deficient number, since it is larger than the sum of its proper divisors (1).

165121237 is an equidigital number, since it uses as much as digits as its factorization.

165121237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 165121237 is about 12849.9508559372. The cubic root of 165121237 is about 548.6149580097.

Adding to 165121237 its reverse (732121561), we get a palindrome (897242798).

The spelling of 165121237 in words is "one hundred sixty-five million, one hundred twenty-one thousand, two hundred thirty-seven".