165401071 has 12 divisors (see below), whose sum is σ = 183859200. Its totient is φ = 148665440.

The previous prime is 165401057. The next prime is 165401081. The reversal of 165401071 is 170104561.

It is a happy number.

It is not a de Polignac number, because 165401071 - 2⁹ = 165400559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165401051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3090 + ... + 18448.

It is an arithmetic number, because the mean of its divisors is an integer number (15321600).

Almost surely, 2^165401071 is an apocalyptic number.

165401071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165401071 is a deficient number, since it is larger than the sum of its proper divisors (18458129).

165401071 is a wasteful number, since it uses less digits than its factorization.

165401071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15470 (or 15459 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 165401071 is about 12860.8347707293. The cubic root of 165401071 is about 548.9246990571.

The spelling of 165401071 in words is "one hundred sixty-five million, four hundred one thousand, seventy-one".