31680223 has 6 divisors (see below), whose sum is σ = 33118064. Its totient is φ = 30302316.

The previous prime is 31680211. The next prime is 31680241. The reversal of 31680223 is 32208613.

It is a de Polignac number, because none of the positive numbers 2^k-31680223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29415 + ... + 30472.

Almost surely, 2^31680223 is an apocalyptic number.

31680223 is a deficient number, since it is larger than the sum of its proper divisors (1437841).

31680223 is an equidigital number, since it uses as much as digits as its factorization.

31680223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59933 (or 59910 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 31680223 is about 5628.5187216531. The cubic root of 31680223 is about 316.4191381748.

Adding to 31680223 its reverse (32208613), we get a palindrome (63888836).

The spelling of 31680223 in words is "thirty-one million, six hundred eighty thousand, two hundred twenty-three".