164721629 has 2 divisors, whose sum is σ = 164721630. Its totient is φ = 164721628.

The previous prime is 164721589. The next prime is 164721637. The reversal of 164721629 is 926127461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156825529 + 7896100 = 12523^2 + 2810^2 .

It is a cyclic number.

It is not a de Polignac number, because 164721629 - 2¹² = 164717533 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 164721592 and 164721601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164721679) 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 as a sum of consecutive naturals, namely, 82360814 + 82360815.

It is an arithmetic number, because the mean of its divisors is an integer number (82360815).

Almost surely, 2^164721629 is an apocalyptic number.

It is an amenable number.

164721629 is a deficient number, since it is larger than the sum of its proper divisors (1).

164721629 is an equidigital number, since it uses as much as digits as its factorization.

164721629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 164721629 is about 12834.3924281596. The cubic root of 164721629 is about 548.1720349369.

The spelling of 164721629 in words is "one hundred sixty-four million, seven hundred twenty-one thousand, six hundred twenty-nine".