164441621 has 2 divisors, whose sum is σ = 164441622. Its totient is φ = 164441620.

The previous prime is 164441617. The next prime is 164441633. The reversal of 164441621 is 126144461.

164441621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163200625 + 1240996 = 12775^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 164441621 - 2² = 164441617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164441671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82220810 + 82220811.

It is an arithmetic number, because the mean of its divisors is an integer number (82220811).

Almost surely, 2^164441621 is an apocalyptic number.

It is an amenable number.

164441621 is a deficient number, since it is larger than the sum of its proper divisors (1).

164441621 is an equidigital number, since it uses as much as digits as its factorization.

164441621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 164441621 is about 12823.4792860596. The cubic root of 164441621 is about 547.8612487707.

The spelling of 164441621 in words is "one hundred sixty-four million, four hundred forty-one thousand, six hundred twenty-one".