8431649 has 4 divisors (see below), whose sum is σ = 8875440. Its totient is φ = 7987860.

The previous prime is 8431637. The next prime is 8431651. The reversal of 8431649 is 9461348.

8431649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8431649 - 2⁸ = 8431393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8431679) 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, 221867 + ... + 221904.

It is an arithmetic number, because the mean of its divisors is an integer number (2218860).

Almost surely, 2^8431649 is an apocalyptic number.

It is an amenable number.

8431649 is a deficient number, since it is larger than the sum of its proper divisors (443791).

8431649 is a wasteful number, since it uses less digits than its factorization.

8431649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443790.

The product of its digits is 20736, while the sum is 35.

The square root of 8431649 is about 2903.7301871903. The cubic root of 8431649 is about 203.5342524149.

The spelling of 8431649 in words is "eight million, four hundred thirty-one thousand, six hundred forty-nine".