164161021 has 4 divisors (see below), whose sum is σ = 164189152. Its totient is φ = 164132892.

The previous prime is 164161001. The next prime is 164161031. The reversal of 164161021 is 120161461.

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 164161021 - 2⁹ = 164160509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164160983 and 164161001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164161001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1671 + ... + 18196.

It is an arithmetic number, because the mean of its divisors is an integer number (41047288).

Almost surely, 2^164161021 is an apocalyptic number.

It is an amenable number.

164161021 is a deficient number, since it is larger than the sum of its proper divisors (28131).

164161021 is an equidigital number, since it uses as much as digits as its factorization.

164161021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28130.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 164161021 is about 12812.5337462970. The cubic root of 164161021 is about 547.5494514106.

The spelling of 164161021 in words is "one hundred sixty-four million, one hundred sixty-one thousand, twenty-one".