164477321 has 4 divisors (see below), whose sum is σ = 168922692. Its totient is φ = 160031952.

The previous prime is 164477311. The next prime is 164477333. The reversal of 164477321 is 123774461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99900025 + 64577296 = 9995^2 + 8036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164477321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164477311) 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, 2222630 + ... + 2222703.

It is an arithmetic number, because the mean of its divisors is an integer number (42230673).

Almost surely, 2^164477321 is an apocalyptic number.

It is an amenable number.

164477321 is a deficient number, since it is larger than the sum of its proper divisors (4445371).

164477321 is an equidigital number, since it uses as much as digits as its factorization.

164477321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445370.

The product of its digits is 28224, while the sum is 35.

The square root of 164477321 is about 12824.8711884369. The cubic root of 164477321 is about 547.9008924880.

The spelling of 164477321 in words is "one hundred sixty-four million, four hundred seventy-seven thousand, three hundred twenty-one".