30390791 has 2 divisors, whose sum is σ = 30390792. Its totient is φ = 30390790.

The previous prime is 30390739. The next prime is 30390793. The reversal of 30390791 is 19709303.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19709303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30390791 - 2²² = 26196487 is a prime.

It is a Sophie Germain prime.

Together with 30390793, 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 (30390793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15195395 + 15195396.

It is an arithmetic number, because the mean of its divisors is an integer number (15195396).

Almost surely, 2^30390791 is an apocalyptic number.

30390791 is a deficient number, since it is larger than the sum of its proper divisors (1).

30390791 is an equidigital number, since it uses as much as digits as its factorization.

30390791 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 30390791 is about 5512.7843237333. The cubic root of 30390791 is about 312.0666325744.

The spelling of 30390791 in words is "thirty million, three hundred ninety thousand, seven hundred ninety-one".