172142081 has 2 divisors, whose sum is σ = 172142082. Its totient is φ = 172142080.

The previous prime is 172141993. The next prime is 172142099. The reversal of 172142081 is 180241271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164352400 + 7789681 = 12820^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 172142081 - 2²⁶ = 105033217 is a prime.

It is a super-2 number, since 2×172142081² = 59265792102021122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172142081.

It is not a weakly prime, because it can be changed into another prime (172142381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86071040 + 86071041.

It is an arithmetic number, because the mean of its divisors is an integer number (86071041).

Almost surely, 2^172142081 is an apocalyptic number.

It is an amenable number.

172142081 is a deficient number, since it is larger than the sum of its proper divisors (1).

172142081 is an equidigital number, since it uses as much as digits as its factorization.

172142081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 172142081 is about 13120.2927177712. The cubic root of 172142081 is about 556.2828652719.

The spelling of 172142081 in words is "one hundred seventy-two million, one hundred forty-two thousand, eighty-one".