172729903 has 2 divisors, whose sum is σ = 172729904. Its totient is φ = 172729902.

The previous prime is 172729901. The next prime is 172729951. The reversal of 172729903 is 309927271.

It is a weak prime.

It is an emirp because it is prime and its reverse (309927271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172729903 - 2¹ = 172729901 is a prime.

Together with 172729901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172729901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86364951 + 86364952.

It is an arithmetic number, because the mean of its divisors is an integer number (86364952).

Almost surely, 2^172729903 is an apocalyptic number.

172729903 is a deficient number, since it is larger than the sum of its proper divisors (1).

172729903 is an equidigital number, since it uses as much as digits as its factorization.

172729903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 172729903 is about 13142.6748799474. The cubic root of 172729903 is about 556.9153346962.

The spelling of 172729903 in words is "one hundred seventy-two million, seven hundred twenty-nine thousand, nine hundred three".