30730991 has 2 divisors, whose sum is σ = 30730992. Its totient is φ = 30730990.

The previous prime is 30730969. The next prime is 30730993. The reversal of 30730991 is 19903703.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30730991 - 2⁶ = 30730927 is a prime.

Together with 30730993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30730993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15365495 + 15365496.

It is an arithmetic number, because the mean of its divisors is an integer number (15365496).

Almost surely, 2^30730991 is an apocalyptic number.

30730991 is a deficient number, since it is larger than the sum of its proper divisors (1).

30730991 is an equidigital number, since it uses as much as digits as its factorization.

30730991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103, while the sum is 32.

The square root of 30730991 is about 5543.5540044271. The cubic root of 30730991 is about 313.2267578037.

The spelling of 30730991 in words is "thirty million, seven hundred thirty thousand, nine hundred ninety-one".