165641093 has 2 divisors, whose sum is σ = 165641094. Its totient is φ = 165641092.

The previous prime is 165641071. The next prime is 165641129. The reversal of 165641093 is 390146561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155800324 + 9840769 = 12482^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 165641093 - 2¹² = 165636997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165641023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82820546 + 82820547.

It is an arithmetic number, because the mean of its divisors is an integer number (82820547).

Almost surely, 2^165641093 is an apocalyptic number.

It is an amenable number.

165641093 is a deficient number, since it is larger than the sum of its proper divisors (1).

165641093 is an equidigital number, since it uses as much as digits as its factorization.

165641093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 165641093 is about 12870.1628971820. The cubic root of 165641093 is about 549.1900950085.

The spelling of 165641093 in words is "one hundred sixty-five million, six hundred forty-one thousand, ninety-three".