30440191 has 2 divisors, whose sum is σ = 30440192. Its totient is φ = 30440190.

The previous prime is 30440141. The next prime is 30440209. The reversal of 30440191 is 19104403.

It is a strong prime.

It is an emirp because it is prime and its reverse (19104403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30440191 - 2⁹ = 30439679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30440101) 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, 15220095 + 15220096.

It is an arithmetic number, because the mean of its divisors is an integer number (15220096).

Almost surely, 2^30440191 is an apocalyptic number.

30440191 is a deficient number, since it is larger than the sum of its proper divisors (1).

30440191 is an equidigital number, since it uses as much as digits as its factorization.

30440191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 30440191 is about 5517.2629989878. The cubic root of 30440191 is about 312.2356283542.

Adding to 30440191 its reverse (19104403), we get a palindrome (49544594).

The spelling of 30440191 in words is "thirty million, four hundred forty thousand, one hundred ninety-one".