31320163 has 12 divisors (see below), whose sum is σ = 36526512. Its totient is φ = 26777520.

The previous prime is 31320109. The next prime is 31320173. The reversal of 31320163 is 36102313.

It is not a de Polignac number, because 31320163 - 2¹⁷ = 31189091 is a prime.

It is a super-2 number, since 2×31320163² = 1961905220693138, 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 31320163.

It is not an unprimeable number, because it can be changed into a prime (31320173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31906 + ... + 32872.

It is an arithmetic number, because the mean of its divisors is an integer number (3043876).

Almost surely, 2^31320163 is an apocalyptic number.

31320163 is a deficient number, since it is larger than the sum of its proper divisors (5206349).

31320163 is an equidigital number, since it uses as much as digits as its factorization.

31320163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 31320163 is about 5596.4419946963. The cubic root of 31320163 is about 315.2158191780.

Adding to 31320163 its reverse (36102313), we get a palindrome (67422476).

The spelling of 31320163 in words is "thirty-one million, three hundred twenty thousand, one hundred sixty-three".