30105947 has 2 divisors, whose sum is σ = 30105948. Its totient is φ = 30105946.

The previous prime is 30105913. The next prime is 30105967. The reversal of 30105947 is 74950103.

It is a strong prime.

It is an emirp because it is prime and its reverse (74950103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30105947 - 2⁶ = 30105883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30105967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15052973 + 15052974.

It is an arithmetic number, because the mean of its divisors is an integer number (15052974).

Almost surely, 2^30105947 is an apocalyptic number.

30105947 is a deficient number, since it is larger than the sum of its proper divisors (1).

30105947 is an equidigital number, since it uses as much as digits as its factorization.

30105947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 30105947 is about 5486.8886447603. Note that the first 3 decimals coincide. The cubic root of 30105947 is about 311.0886008042.

The spelling of 30105947 in words is "thirty million, one hundred five thousand, nine hundred forty-seven".