171491988029 has 4 divisors (see below), whose sum is σ = 171532314876. Its totient is φ = 171451661184.

The previous prime is 171491988013. The next prime is 171491988043. The reversal of 171491988029 is 920889194171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 920889194171 = 29 ⋅31754799799.

It can be written as a sum of positive squares in 2 ways, for example, as 42160408900 + 129331579129 = 205330^2 + 359627^2 .

It is a cyclic number.

It is not a de Polignac number, because 171491988029 - 2⁴ = 171491988013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171491988079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20157044 + ... + 20165549.

It is an arithmetic number, because the mean of its divisors is an integer number (42883078719).

Almost surely, 2^171491988029 is an apocalyptic number.

It is an amenable number.

171491988029 is a deficient number, since it is larger than the sum of its proper divisors (40326847).

171491988029 is an equidigital number, since it uses as much as digits as its factorization.

171491988029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40326846.

The product of its (nonzero) digits is 2612736, while the sum is 59.

The spelling of 171491988029 in words is "one hundred seventy-one billion, four hundred ninety-one million, nine hundred eighty-eight thousand, twenty-nine".