171972029 has 2 divisors, whose sum is σ = 171972030. Its totient is φ = 171972028.

The previous prime is 171971959. The next prime is 171972083. The reversal of 171972029 is 920279171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92352100 + 79619929 = 9610^2 + 8923^2 .

It is a cyclic number.

It is not a de Polignac number, because 171972029 - 2²⁴ = 155194813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171971983 and 171972001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171971029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85986014 + 85986015.

It is an arithmetic number, because the mean of its divisors is an integer number (85986015).

Almost surely, 2^171972029 is an apocalyptic number.

It is an amenable number.

171972029 is a deficient number, since it is larger than the sum of its proper divisors (1).

171972029 is an equidigital number, since it uses as much as digits as its factorization.

171972029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 171972029 is about 13113.8106208684. The cubic root of 171972029 is about 556.0996286884.

The spelling of 171972029 in words is "one hundred seventy-one million, nine hundred seventy-two thousand, twenty-nine".