31223873 has 2 divisors, whose sum is σ = 31223874. Its totient is φ = 31223872.

The previous prime is 31223869. The next prime is 31223879. The reversal of 31223873 is 37832213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30658369 + 565504 = 5537^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223873 - 2² = 31223869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31223879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611936 + 15611937.

It is an arithmetic number, because the mean of its divisors is an integer number (15611937).

Almost surely, 2^31223873 is an apocalyptic number.

It is an amenable number.

31223873 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223873 is an equidigital number, since it uses as much as digits as its factorization.

31223873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 31223873 is about 5587.8325851801. The cubic root of 31223873 is about 314.8924567794.

The spelling of 31223873 in words is "thirty-one million, two hundred twenty-three thousand, eight hundred seventy-three".