8320631 has 4 divisors (see below), whose sum is σ = 9077064. Its totient is φ = 7564200.

The previous prime is 8320619. The next prime is 8320657. The reversal of 8320631 is 1360238.

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

It is a cyclic number.

It is not a de Polignac number, because 8320631 - 2⁶ = 8320567 is a prime.

It is a super-2 number, since 2×8320631² = 138465800476322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8320597 and 8320606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8320601) 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, 378200 + ... + 378221.

It is an arithmetic number, because the mean of its divisors is an integer number (2269266).

Almost surely, 2^8320631 is an apocalyptic number.

8320631 is a deficient number, since it is larger than the sum of its proper divisors (756433).

8320631 is a wasteful number, since it uses less digits than its factorization.

8320631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756432.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 8320631 is about 2884.5503982423. The cubic root of 8320631 is about 202.6370032594.

Adding to 8320631 its reverse (1360238), we get a palindrome (9680869).

The spelling of 8320631 in words is "eight million, three hundred twenty thousand, six hundred thirty-one".