18102947 has 2 divisors, whose sum is σ = 18102948. Its totient is φ = 18102946.

The previous prime is 18102923. The next prime is 18102949. The reversal of 18102947 is 74920181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18102947 - 2⁶ = 18102883 is a prime.

Together with 18102949, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18102949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9051473 + 9051474.

It is an arithmetic number, because the mean of its divisors is an integer number (9051474).

Almost surely, 2^18102947 is an apocalyptic number.

18102947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18102947 is an equidigital number, since it uses as much as digits as its factorization.

18102947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18102947 is about 4254.7558096793. The cubic root of 18102947 is about 262.5728148718.

The spelling of 18102947 in words is "eighteen million, one hundred two thousand, nine hundred forty-seven".