99999999947 has 2 divisors, whose sum is σ = 99999999948. Its totient is φ = 99999999946.

The previous prime is 99999999943. The next prime is 99999999977. The reversal of 99999999947 is 74999999999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99999999947 - 2² = 99999999943 is a prime.

It is not a weakly prime, because it can be changed into another prime (99999999943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999999973 + 49999999974.

It is an arithmetic number, because the mean of its divisors is an integer number (49999999974).

Almost surely, 2^99999999947 is an apocalyptic number.

99999999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999999947 is an equidigital number, since it uses as much as digits as its factorization.

99999999947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10847773692, while the sum is 92.

It can be divided in two parts, 9999999994 and 7, that added together give a palindrome (10000000001).

The spelling of 99999999947 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".