31643663 has 2 divisors, whose sum is σ = 31643664. Its totient is φ = 31643662.

The previous prime is 31643659. The next prime is 31643671. The reversal of 31643663 is 36634613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31643663 - 2² = 31643659 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31643693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15821831 + 15821832.

It is an arithmetic number, because the mean of its divisors is an integer number (15821832).

Almost surely, 2^31643663 is an apocalyptic number.

31643663 is a deficient number, since it is larger than the sum of its proper divisors (1).

31643663 is an equidigital number, since it uses as much as digits as its factorization.

31643663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 32.

The square root of 31643663 is about 5625.2700379626. The cubic root of 31643663 is about 316.2973720222.

The spelling of 31643663 in words is "thirty-one million, six hundred forty-three thousand, six hundred sixty-three".