165257243 has 2 divisors, whose sum is σ = 165257244. Its totient is φ = 165257242.

The previous prime is 165257219. The next prime is 165257263. The reversal of 165257243 is 342752561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165257243 - 2¹² = 165253147 is a prime.

It is a super-2 number, since 2×165257243² = 54619912727922098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165257203) 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, 82628621 + 82628622.

It is an arithmetic number, because the mean of its divisors is an integer number (82628622).

Almost surely, 2^165257243 is an apocalyptic number.

165257243 is a deficient number, since it is larger than the sum of its proper divisors (1).

165257243 is an equidigital number, since it uses as much as digits as its factorization.

165257243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 35.

The square root of 165257243 is about 12855.2418491447. The cubic root of 165257243 is about 548.7655432213.

The spelling of 165257243 in words is "one hundred sixty-five million, two hundred fifty-seven thousand, two hundred forty-three".