172209245129 has 2 divisors, whose sum is σ = 172209245130. Its totient is φ = 172209245128.

The previous prime is 172209245107. The next prime is 172209245141. The reversal of 172209245129 is 921542902271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146520528400 + 25688716729 = 382780^2 + 160277^2 .

It is a cyclic number.

It is not a de Polignac number, because 172209245129 - 2²⁴ = 172192467913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172209245129.

It is not a weakly prime, because it can be changed into another prime (172209245179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86104622564 + 86104622565.

It is an arithmetic number, because the mean of its divisors is an integer number (86104622565).

Almost surely, 2^172209245129 is an apocalyptic number.

It is an amenable number.

172209245129 is a deficient number, since it is larger than the sum of its proper divisors (1).

172209245129 is an equidigital number, since it uses as much as digits as its factorization.

172209245129 is an evil number, because the sum of its binary digits is even.

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

The spelling of 172209245129 in words is "one hundred seventy-two billion, two hundred nine million, two hundred forty-five thousand, one hundred twenty-nine".