31663443 has 16 divisors (see below), whose sum is σ = 50789120. Its totient is φ = 17140896.

The previous prime is 31663417. The next prime is 31663559. The reversal of 31663443 is 34436613.

It is not a de Polignac number, because 31663443 - 2⁸ = 31663187 is a prime.

It is a super-2 number, since 2×31663443² = 2005147245228498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31663443.

It is not an unprimeable number, because it can be changed into a prime (31663343) 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 in 15 ways as a sum of consecutive naturals, for example, 39280 + ... + 40077.

It is an arithmetic number, because the mean of its divisors is an integer number (3174320).

Almost surely, 2^31663443 is an apocalyptic number.

31663443 is a deficient number, since it is larger than the sum of its proper divisors (19125677).

31663443 is a wasteful number, since it uses less digits than its factorization.

31663443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79386.

The product of its digits is 15552, while the sum is 30.

The square root of 31663443 is about 5627.0279011215. The cubic root of 31663443 is about 316.3632626123.

The spelling of 31663443 in words is "thirty-one million, six hundred sixty-three thousand, four hundred forty-three".