31979471 has 2 divisors, whose sum is σ = 31979472. Its totient is φ = 31979470.

The previous prime is 31979447. The next prime is 31979473. The reversal of 31979471 is 17497913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31979471 - 2¹⁰ = 31978447 is a prime.

It is a super-3 number, since 3×31979471³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 31979473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31979473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15989735 + 15989736.

It is an arithmetic number, because the mean of its divisors is an integer number (15989736).

Almost surely, 2^31979471 is an apocalyptic number.

31979471 is a deficient number, since it is larger than the sum of its proper divisors (1).

31979471 is an equidigital number, since it uses as much as digits as its factorization.

31979471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 41.

The square root of 31979471 is about 5655.0394339916. The cubic root of 31979471 is about 317.4123047116.

The spelling of 31979471 in words is "thirty-one million, nine hundred seventy-nine thousand, four hundred seventy-one".