172138883429 has 2 divisors, whose sum is σ = 172138883430. Its totient is φ = 172138883428.

The previous prime is 172138883383. The next prime is 172138883437. The reversal of 172138883429 is 924388831271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114936594529 + 57202288900 = 339023^2 + 239170^2 .

It is a cyclic number.

It is not a de Polignac number, because 172138883429 - 2²⁰ = 172137834853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172138883459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86069441714 + 86069441715.

It is an arithmetic number, because the mean of its divisors is an integer number (86069441715).

Almost surely, 2^172138883429 is an apocalyptic number.

It is an amenable number.

172138883429 is a deficient number, since it is larger than the sum of its proper divisors (1).

172138883429 is an equidigital number, since it uses as much as digits as its factorization.

172138883429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 56.

The spelling of 172138883429 in words is "one hundred seventy-two billion, one hundred thirty-eight million, eight hundred eighty-three thousand, four hundred twenty-nine".