30731009 has 2 divisors, whose sum is σ = 30731010. Its totient is φ = 30731008.

The previous prime is 30730993. The next prime is 30731011. The reversal of 30731009 is 90013703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30558784 + 172225 = 5528^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 30731009 - 2⁴ = 30730993 is a prime.

It is a Sophie Germain prime.

Together with 30731011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30731089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15365504 + 15365505.

It is an arithmetic number, because the mean of its divisors is an integer number (15365505).

Almost surely, 2^30731009 is an apocalyptic number.

It is an amenable number.

30731009 is a deficient number, since it is larger than the sum of its proper divisors (1).

30731009 is an equidigital number, since it uses as much as digits as its factorization.

30731009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 23.

The square root of 30731009 is about 5543.5556279341. Note that the first 3 decimals coincide. The cubic root of 30731009 is about 313.2268189589.

The spelling of 30731009 in words is "thirty million, seven hundred thirty-one thousand, nine".