172964021 has 2 divisors, whose sum is σ = 172964022. Its totient is φ = 172964020.

The previous prime is 172964009. The next prime is 172964059. The reversal of 172964021 is 120469271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126315121 + 46648900 = 11239^2 + 6830^2 .

It is a cyclic number.

It is not a de Polignac number, because 172964021 - 2⁶ = 172963957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172964321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86482010 + 86482011.

It is an arithmetic number, because the mean of its divisors is an integer number (86482011).

Almost surely, 2^172964021 is an apocalyptic number.

It is an amenable number.

172964021 is a deficient number, since it is larger than the sum of its proper divisors (1).

172964021 is an equidigital number, since it uses as much as digits as its factorization.

172964021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 172964021 is about 13151.5786504891. The cubic root of 172964021 is about 557.1668353319.

The spelling of 172964021 in words is "one hundred seventy-two million, nine hundred sixty-four thousand, twenty-one".