165311249 has 2 divisors, whose sum is σ = 165311250. Its totient is φ = 165311248.

The previous prime is 165311239. The next prime is 165311257. The reversal of 165311249 is 942113561.

165311249 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., 134397649 + 30913600 = 11593^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 165311249 - 2²⁴ = 148534033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165311239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82655624 + 82655625.

It is an arithmetic number, because the mean of its divisors is an integer number (82655625).

Almost surely, 2^165311249 is an apocalyptic number.

It is an amenable number.

165311249 is a deficient number, since it is larger than the sum of its proper divisors (1).

165311249 is an equidigital number, since it uses as much as digits as its factorization.

165311249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 165311249 is about 12857.3422214702. The cubic root of 165311249 is about 548.8253154963.

The spelling of 165311249 in words is "one hundred sixty-five million, three hundred eleven thousand, two hundred forty-nine".