8631609 has 16 divisors (see below), whose sum is σ = 13578240. Its totient is φ = 4772880.

The previous prime is 8631599. The next prime is 8631611. The reversal of 8631609 is 9061368.

8631609 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8631609 - 2⁹ = 8631097 is a prime.

8631609 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8631609.

It is not an unprimeable number, because it can be changed into a prime (8631629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5979 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (848640).

Almost surely, 2^8631609 is an apocalyptic number.

It is an amenable number.

8631609 is a deficient number, since it is larger than the sum of its proper divisors (4946631).

8631609 is a wasteful number, since it uses less digits than its factorization.

8631609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13300.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 8631609 is about 2937.9600065351. The cubic root of 8631609 is about 205.1306642695.

The spelling of 8631609 in words is "eight million, six hundred thirty-one thousand, six hundred nine".