172129607389 has 2 divisors, whose sum is σ = 172129607390. Its totient is φ = 172129607388.

The previous prime is 172129607381. The next prime is 172129607509. The reversal of 172129607389 is 983706921271.

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., 121464099289 + 50665508100 = 348517^2 + 225090^2 .

It is an emirp because it is prime and its reverse (983706921271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172129607389 - 2³ = 172129607381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172129607381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86064803694 + 86064803695.

It is an arithmetic number, because the mean of its divisors is an integer number (86064803695).

Almost surely, 2^172129607389 is an apocalyptic number.

It is an amenable number.

172129607389 is a deficient number, since it is larger than the sum of its proper divisors (1).

172129607389 is an equidigital number, since it uses as much as digits as its factorization.

172129607389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 172129607389 in words is "one hundred seventy-two billion, one hundred twenty-nine million, six hundred seven thousand, three hundred eighty-nine".