8163649 has 4 divisors (see below), whose sum is σ = 8791636. Its totient is φ = 7535664.

The previous prime is 8163647. The next prime is 8163709. The reversal of 8163649 is 9463618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4431025 + 3732624 = 2105^2 + 1932^2 .

It is a cyclic number.

It is not a de Polignac number, because 8163649 - 2¹ = 8163647 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8163641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313974 + ... + 313999.

It is an arithmetic number, because the mean of its divisors is an integer number (2197909).

Almost surely, 2^8163649 is an apocalyptic number.

It is an amenable number.

8163649 is a deficient number, since it is larger than the sum of its proper divisors (627987).

8163649 is a wasteful number, since it uses less digits than its factorization.

8163649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627986.

The product of its digits is 31104, while the sum is 37.

The square root of 8163649 is about 2857.2100027824. The cubic root of 8163649 is about 201.3545469682.

It can be divided in two parts, 816 and 3649, that added together give a triangular number (4465 = T₉₄).

The spelling of 8163649 in words is "eight million, one hundred sixty-three thousand, six hundred forty-nine".