31489673 has 2 divisors, whose sum is σ = 31489674. Its totient is φ = 31489672.

The previous prime is 31489663. The next prime is 31489709. The reversal of 31489673 is 37698413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27541504 + 3948169 = 5248^2 + 1987^2 .

It is a cyclic number.

It is not a de Polignac number, because 31489673 - 2⁸ = 31489417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31489673.

It is not a weakly prime, because it can be changed into another prime (31489613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15744836 + 15744837.

It is an arithmetic number, because the mean of its divisors is an integer number (15744837).

Almost surely, 2^31489673 is an apocalyptic number.

It is an amenable number.

31489673 is a deficient number, since it is larger than the sum of its proper divisors (1).

31489673 is an equidigital number, since it uses as much as digits as its factorization.

31489673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 31489673 is about 5611.5660024631. The cubic root of 31489673 is about 315.7834633880.

It can be divided in two parts, 3148 and 9673, that added together give a palindrome (12821).

The spelling of 31489673 in words is "thirty-one million, four hundred eighty-nine thousand, six hundred seventy-three".