31125443 has 2 divisors, whose sum is σ = 31125444. Its totient is φ = 31125442.

The previous prime is 31125431. The next prime is 31125449. The reversal of 31125443 is 34452113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31125443 - 2⁴ = 31125427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31125449) 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, 15562721 + 15562722.

It is an arithmetic number, because the mean of its divisors is an integer number (15562722).

Almost surely, 2^31125443 is an apocalyptic number.

31125443 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125443 is an equidigital number, since it uses as much as digits as its factorization.

31125443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 31125443 is about 5579.0181035734. The cubic root of 31125443 is about 314.5612199398.

Adding to 31125443 its reverse (34452113), we get a palindrome (65577556).

The spelling of 31125443 in words is "thirty-one million, one hundred twenty-five thousand, four hundred forty-three".