99920047 has 2 divisors, whose sum is σ = 99920048. Its totient is φ = 99920046.

The previous prime is 99920039. The next prime is 99920053. The reversal of 99920047 is 74002999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99920047 - 2³ = 99920039 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99919991 and 99920009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99920087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49960023 + 49960024.

It is an arithmetic number, because the mean of its divisors is an integer number (49960024).

Almost surely, 2^99920047 is an apocalyptic number.

99920047 is a deficient number, since it is larger than the sum of its proper divisors (1).

99920047 is an equidigital number, since it uses as much as digits as its factorization.

99920047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 99920047 is about 9996.0015506201. The cubic root of 99920047 is about 464.0351473945.

The spelling of 99920047 in words is "ninety-nine million, nine hundred twenty thousand, forty-seven".