31730137 has 2 divisors, whose sum is σ = 31730138. Its totient is φ = 31730136.

The previous prime is 31730119. The next prime is 31730197. The reversal of 31730137 is 73103713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 549081 = 5584^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 31730137 - 2¹¹ = 31728089 is a prime.

It is not a weakly prime, because it can be changed into another prime (31730197) 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, 15865068 + 15865069.

It is an arithmetic number, because the mean of its divisors is an integer number (15865069).

Almost surely, 2^31730137 is an apocalyptic number.

It is an amenable number.

31730137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31730137 is an equidigital number, since it uses as much as digits as its factorization.

31730137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1323, while the sum is 25.

The square root of 31730137 is about 5632.9510028048. The cubic root of 31730137 is about 316.5852297820.

The spelling of 31730137 in words is "thirty-one million, seven hundred thirty thousand, one hundred thirty-seven".