165727121 has 8 divisors (see below), whose sum is σ = 197637504. Its totient is φ = 135875520.

The previous prime is 165727099. The next prime is 165727151. The reversal of 165727121 is 121727561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165727121 - 2¹⁴ = 165710737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165727151) 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 in 7 ways as a sum of consecutive naturals, for example, 514520 + ... + 514841.

It is an arithmetic number, because the mean of its divisors is an integer number (24704688).

Almost surely, 2^165727121 is an apocalyptic number.

It is an amenable number.

165727121 is a deficient number, since it is larger than the sum of its proper divisors (31910383).

165727121 is a wasteful number, since it uses less digits than its factorization.

165727121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029391.

The product of its digits is 5880, while the sum is 32.

The square root of 165727121 is about 12873.5046121870. The cubic root of 165727121 is about 549.2851550522.

The spelling of 165727121 in words is "one hundred sixty-five million, seven hundred twenty-seven thousand, one hundred twenty-one".