31040689 has 2 divisors, whose sum is σ = 31040690. Its totient is φ = 31040688.

The previous prime is 31040683. The next prime is 31040707. The reversal of 31040689 is 98604013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 6290064 = 4975^2 + 2508^2 .

It is a cyclic number.

It is not a de Polignac number, because 31040689 - 2¹¹ = 31038641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31040689.

It is not a weakly prime, because it can be changed into another prime (31040683) 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, 15520344 + 15520345.

It is an arithmetic number, because the mean of its divisors is an integer number (15520345).

Almost surely, 2^31040689 is an apocalyptic number.

It is an amenable number.

31040689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31040689 is an equidigital number, since it uses as much as digits as its factorization.

31040689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 31040689 is about 5571.4171446769. The cubic root of 31040689 is about 314.2754456208.

The spelling of 31040689 in words is "thirty-one million, forty thousand, six hundred eighty-nine".