9918122147 has 2 divisors, whose sum is σ = 9918122148. Its totient is φ = 9918122146.

The previous prime is 9918122033. The next prime is 9918122153. The reversal of 9918122147 is 7412218199.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9918122147 - 2¹⁸ = 9917860003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9918122098 and 9918122107.

It is not a weakly prime, because it can be changed into another prime (9918122197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959061073 + 4959061074.

It is an arithmetic number, because the mean of its divisors is an integer number (4959061074).

Almost surely, 2^9918122147 is an apocalyptic number.

9918122147 is a deficient number, since it is larger than the sum of its proper divisors (1).

9918122147 is an equidigital number, since it uses as much as digits as its factorization.

9918122147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 9918122147 is about 99589.7692888180. The cubic root of 9918122147 is about 2148.5385523001.

The spelling of 9918122147 in words is "nine billion, nine hundred eighteen million, one hundred twenty-two thousand, one hundred forty-seven".