172239085061 has 2 divisors, whose sum is σ = 172239085062. Its totient is φ = 172239085060.

The previous prime is 172239084973. The next prime is 172239085111. The reversal of 172239085061 is 160580932271.

172239085061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104955912961 + 67283172100 = 323969^2 + 259390^2 .

It is a cyclic number.

It is not a de Polignac number, because 172239085061 - 2²² = 172234890757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172239085561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86119542530 + 86119542531.

It is an arithmetic number, because the mean of its divisors is an integer number (86119542531).

Almost surely, 2^172239085061 is an apocalyptic number.

It is an amenable number.

172239085061 is a deficient number, since it is larger than the sum of its proper divisors (1).

172239085061 is an equidigital number, since it uses as much as digits as its factorization.

172239085061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 172239085061 in words is "one hundred seventy-two billion, two hundred thirty-nine million, eighty-five thousand, sixty-one".