165701121 has 4 divisors (see below), whose sum is σ = 220934832. Its totient is φ = 110467412.

The previous prime is 165701119. The next prime is 165701171. The reversal of 165701121 is 121107561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165701121 - 2¹ = 165701119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165701091 and 165701100.

It is not an unprimeable number, because it can be changed into a prime (165701171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27616851 + ... + 27616856.

It is an arithmetic number, because the mean of its divisors is an integer number (55233708).

Almost surely, 2^165701121 is an apocalyptic number.

It is an amenable number.

165701121 is a deficient number, since it is larger than the sum of its proper divisors (55233711).

165701121 is an equidigital number, since it uses as much as digits as its factorization.

165701121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55233710.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 165701121 is about 12872.4947465517. The cubic root of 165701121 is about 549.2564287925.

Adding to 165701121 its reverse (121107561), we get a palindrome (286808682).

The spelling of 165701121 in words is "one hundred sixty-five million, seven hundred one thousand, one hundred twenty-one".