8173425649 has 3 divisors (see below), whose sum is σ = 8173516057. Its totient is φ = 8173335242.

The previous prime is 8173425647. The next prime is 8173425691. The reversal of 8173425649 is 9465243718.

It is a happy number.

The square root of 8173425649 is 90407.

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 is not a de Polignac number, because 8173425649 - 2¹ = 8173425647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8173425647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45204 + ... + 135610.

Almost surely, 2^8173425649 is an apocalyptic number.

8173425649 is the 90407-th square number.

8173425649 is the 45204-th centered octagonal number.

It is an amenable number.

8173425649 is a deficient number, since it is larger than the sum of its proper divisors (90408).

8173425649 is an frugal number, since it uses more digits than its factorization.

8173425649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180814 (or 90407 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The cubic root of 8173425649 is about 2014.3489451091.

Multiplying 8173425649 by its sum of digits (49), we get a square (400497856801 = 632849²).

The spelling of 8173425649 in words is "eight billion, one hundred seventy-three million, four hundred twenty-five thousand, six hundred forty-nine".