172864609 has 2 divisors, whose sum is σ = 172864610. Its totient is φ = 172864608.

The previous prime is 172864567. The next prime is 172864633. The reversal of 172864609 is 906468271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160579584 + 12285025 = 12672^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 172864609 - 2¹³ = 172856417 is a prime.

It is equal to p_9654289 and since 172864609 and 9654289 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (172864669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86432304 + 86432305.

It is an arithmetic number, because the mean of its divisors is an integer number (86432305).

Almost surely, 2^172864609 is an apocalyptic number.

It is an amenable number.

172864609 is a deficient number, since it is larger than the sum of its proper divisors (1).

172864609 is an equidigital number, since it uses as much as digits as its factorization.

172864609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 172864609 is about 13147.7986370343. The cubic root of 172864609 is about 557.0600699977.

The spelling of 172864609 in words is "one hundred seventy-two million, eight hundred sixty-four thousand, six hundred nine".