165251969 has 2 divisors, whose sum is σ = 165251970. Its totient is φ = 165251968.

The previous prime is 165251929. The next prime is 165251981. The reversal of 165251969 is 969152561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113699569 + 51552400 = 10663^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 165251969 - 2²⁰ = 164203393 is a prime.

It is a super-2 number, since 2×165251969² = 54616426516753922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165251909) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82625984 + 82625985.

It is an arithmetic number, because the mean of its divisors is an integer number (82625985).

Almost surely, 2^165251969 is an apocalyptic number.

It is an amenable number.

165251969 is a deficient number, since it is larger than the sum of its proper divisors (1).

165251969 is an equidigital number, since it uses as much as digits as its factorization.

165251969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 44.

The square root of 165251969 is about 12855.0367171782. The cubic root of 165251969 is about 548.7597054131.

The spelling of 165251969 in words is "one hundred sixty-five million, two hundred fifty-one thousand, nine hundred sixty-nine".