172704242929 has 3 divisors (see below), whose sum is σ = 172704658507. Its totient is φ = 172703827352.

The previous prime is 172704242849. The next prime is 172704242951. The reversal of 172704242929 is 929242407271.

The square root of 172704242929 is 415577.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 171309071025 + 1395171904 = 413895^2 + 37352^2 .

It is a de Polignac number, because none of the positive numbers 2^k-172704242929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172704242129) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 207789 + ... + 623365.

Almost surely, 2^172704242929 is an apocalyptic number.

172704242929 is the 415577-th square number.

172704242929 is the 207789-th centered octagonal number.

It is an amenable number.

172704242929 is a deficient number, since it is larger than the sum of its proper divisors (415578).

172704242929 is an frugal number, since it uses more digits than its factorization.

172704242929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831154 (or 415577 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

Multiplying 172704242929 by its sum of digits (49), we get a square (8462507903521 = 2909039²).

The spelling of 172704242929 in words is "one hundred seventy-two billion, seven hundred four million, two hundred forty-two thousand, nine hundred twenty-nine".