99219947 has 2 divisors, whose sum is σ = 99219948. Its totient is φ = 99219946.

The previous prime is 99219937. The next prime is 99219979. The reversal of 99219947 is 74991299.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99219947 - 2⁴ = 99219931 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99219895 and 99219904.

It is not a weakly prime, because it can be changed into another prime (99219937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49609973 + 49609974.

It is an arithmetic number, because the mean of its divisors is an integer number (49609974).

Almost surely, 2^99219947 is an apocalyptic number.

99219947 is a deficient number, since it is larger than the sum of its proper divisors (1).

99219947 is an equidigital number, since it uses as much as digits as its factorization.

99219947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 50.

The square root of 99219947 is about 9960.9209915549. The cubic root of 99219947 is about 462.9488364520.

The spelling of 99219947 in words is "ninety-nine million, two hundred nineteen thousand, nine hundred forty-seven".