172823949841 has 3 divisors (see below), whose sum is σ = 172824365563. Its totient is φ = 172823534120.

The previous prime is 172823949839. The next prime is 172823949877. The reversal of 172823949841 is 148949328271.

The square root of 172823949841 is 415721.

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: 148949328271 = 31 ⋅4804817041.

It can be written as a sum of positive squares in only one way, i.e., 1262309841 + 171561640000 = 35529^2 + 414200^2 .

It is not a de Polignac number, because 172823949841 - 2¹ = 172823949839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172823949541) 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, 207861 + ... + 623581.

Almost surely, 2^172823949841 is an apocalyptic number.

172823949841 is the 415721-st square number.

172823949841 is the 207861-st centered octagonal number.

It is an amenable number.

172823949841 is a deficient number, since it is larger than the sum of its proper divisors (415722).

172823949841 is an frugal number, since it uses more digits than its factorization.

172823949841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831442 (or 415721 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 172823949841 in words is "one hundred seventy-two billion, eight hundred twenty-three million, nine hundred forty-nine thousand, eight hundred forty-one".