31968647 has 2 divisors, whose sum is σ = 31968648. Its totient is φ = 31968646.

The previous prime is 31968631. The next prime is 31968649. The reversal of 31968647 is 74686913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31968647 - 2⁴ = 31968631 is a prime.

It is a super-3 number, since 3×31968647³ (a number of 23 digits) contains 333 as substring.

Together with 31968649, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31968598 and 31968607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31968649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15984323 + 15984324.

It is an arithmetic number, because the mean of its divisors is an integer number (15984324).

Almost surely, 2^31968647 is an apocalyptic number.

31968647 is a deficient number, since it is larger than the sum of its proper divisors (1).

31968647 is an equidigital number, since it uses as much as digits as its factorization.

31968647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 31968647 is about 5654.0823304936. The cubic root of 31968647 is about 317.3764894592.

The spelling of 31968647 in words is "thirty-one million, nine hundred sixty-eight thousand, six hundred forty-seven".