172106330449 has 3 divisors (see below), whose sum is σ = 172106745307. Its totient is φ = 172105915592.

The previous prime is 172106330437. The next prime is 172106330453. The reversal of 172106330449 is 944033601271.

The square root of 172106330449 is 414857.

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, and also an emirpimes, since its reverse is a distinct semiprime: 944033601271 = 43 ⋅21954269797.

It can be written as a sum of positive squares in only one way, i.e., 171905598225 + 200732224 = 414615^2 + 14168^2 .

It is not a de Polignac number, because 172106330449 - 2²¹ = 172104233297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172106330749) 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, 207429 + ... + 622285.

Almost surely, 2^172106330449 is an apocalyptic number.

172106330449 is the 414857-th square number.

172106330449 is the 207429-th centered octagonal number.

It is an amenable number.

172106330449 is a deficient number, since it is larger than the sum of its proper divisors (414858).

172106330449 is an frugal number, since it uses more digits than its factorization.

172106330449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829714 (or 414857 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 172106330449 in words is "one hundred seventy-two billion, one hundred six million, three hundred thirty thousand, four hundred forty-nine".