31730873 has 2 divisors, whose sum is σ = 31730874. Its totient is φ = 31730872.

The previous prime is 31730863. The next prime is 31730899. The reversal of 31730873 is 37803713.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31719424 + 11449 = 5632^2 + 107^2 .

It is a cyclic number.

It is not a de Polignac number, because 31730873 - 2¹⁴ = 31714489 is a prime.

It is not a weakly prime, because it can be changed into another prime (31730833) 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, 15865436 + 15865437.

It is an arithmetic number, because the mean of its divisors is an integer number (15865437).

Almost surely, 2^31730873 is an apocalyptic number.

It is an amenable number.

31730873 is a deficient number, since it is larger than the sum of its proper divisors (1).

31730873 is an equidigital number, since it uses as much as digits as its factorization.

31730873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 31730873 is about 5633.0163323037. The cubic root of 31730873 is about 316.5876775593.

The spelling of 31730873 in words is "thirty-one million, seven hundred thirty thousand, eight hundred seventy-three".