909990099947 has 2 divisors, whose sum is σ = 909990099948. Its totient is φ = 909990099946.

The previous prime is 909990099883. The next prime is 909990099959. The reversal of 909990099947 is 749990099909.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 909990099947 - 2⁶ = 909990099883 is a prime.

It is not a weakly prime, because it can be changed into another prime (909990099247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454995049973 + 454995049974.

It is an arithmetic number, because the mean of its divisors is an integer number (454995049974).

Almost surely, 2^909990099947 is an apocalyptic number.

909990099947 is a deficient number, since it is larger than the sum of its proper divisors (1).

909990099947 is an equidigital number, since it uses as much as digits as its factorization.

909990099947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 133923132, while the sum is 74.

The spelling of 909990099947 in words is "nine hundred nine billion, nine hundred ninety million, ninety-nine thousand, nine hundred forty-seven".