172906838281 has 2 divisors, whose sum is σ = 172906838282. Its totient is φ = 172906838280.

The previous prime is 172906838257. The next prime is 172906838317. The reversal of 172906838281 is 182838609271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153225273600 + 19681564681 = 391440^2 + 140291^2 .

It is a cyclic number.

It is not a de Polignac number, because 172906838281 - 2¹¹ = 172906836233 is a prime.

It is a super-2 number, since 2×172906838281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172906838231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86453419140 + 86453419141.

It is an arithmetic number, because the mean of its divisors is an integer number (86453419141).

Almost surely, 2^172906838281 is an apocalyptic number.

It is an amenable number.

172906838281 is a deficient number, since it is larger than the sum of its proper divisors (1).

172906838281 is an equidigital number, since it uses as much as digits as its factorization.

172906838281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 172906838281 in words is "one hundred seventy-two billion, nine hundred six million, eight hundred thirty-eight thousand, two hundred eighty-one".