320631863 has 2 divisors, whose sum is σ = 320631864. Its totient is φ = 320631862.

The previous prime is 320631833. The next prime is 320631887. The reversal of 320631863 is 368136023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320631863 - 2¹² = 320627767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320631803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160315931 + 160315932.

It is an arithmetic number, because the mean of its divisors is an integer number (160315932).

Almost surely, 2^320631863 is an apocalyptic number.

320631863 is a deficient number, since it is larger than the sum of its proper divisors (1).

320631863 is an equidigital number, since it uses as much as digits as its factorization.

320631863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 320631863 is about 17906.1962180693. The cubic root of 320631863 is about 684.4402787353.

Adding to 320631863 its reverse (368136023), we get a palindrome (688767886).

The spelling of 320631863 in words is "three hundred twenty million, six hundred thirty-one thousand, eight hundred sixty-three".