172136446129 has 2 divisors, whose sum is σ = 172136446130. Its totient is φ = 172136446128.

The previous prime is 172136446127. The next prime is 172136446189. The reversal of 172136446129 is 921644631271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125156750625 + 46979695504 = 353775^2 + 216748^2 .

It is a cyclic number.

It is not a de Polignac number, because 172136446129 - 2¹ = 172136446127 is a prime.

Together with 172136446127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (172136446121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86068223064 + 86068223065.

It is an arithmetic number, because the mean of its divisors is an integer number (86068223065).

Almost surely, 2^172136446129 is an apocalyptic number.

It is an amenable number.

172136446129 is a deficient number, since it is larger than the sum of its proper divisors (1).

172136446129 is an equidigital number, since it uses as much as digits as its factorization.

172136446129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The spelling of 172136446129 in words is "one hundred seventy-two billion, one hundred thirty-six million, four hundred forty-six thousand, one hundred twenty-nine".