31123427 has 2 divisors, whose sum is σ = 31123428. Its totient is φ = 31123426.

The previous prime is 31123403. The next prime is 31123429. The reversal of 31123427 is 72432113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31123427 - 2¹⁶ = 31057891 is a prime.

Together with 31123429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31123429) 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 as a sum of consecutive naturals, namely, 15561713 + 15561714.

It is an arithmetic number, because the mean of its divisors is an integer number (15561714).

Almost surely, 2^31123427 is an apocalyptic number.

31123427 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123427 is an equidigital number, since it uses as much as digits as its factorization.

31123427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 31123427 is about 5578.8374236932. The cubic root of 31123427 is about 314.5544283994.

The spelling of 31123427 in words is "thirty-one million, one hundred twenty-three thousand, four hundred twenty-seven".