9929681947 has 2 divisors, whose sum is σ = 9929681948. Its totient is φ = 9929681946.

The previous prime is 9929681939. The next prime is 9929681977. The reversal of 9929681947 is 7491869299.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9929681947 - 2³ = 9929681939 is a prime.

It is not a weakly prime, because it can be changed into another prime (9929681977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4964840973 + 4964840974.

It is an arithmetic number, because the mean of its divisors is an integer number (4964840974).

Almost surely, 2^9929681947 is an apocalyptic number.

9929681947 is a deficient number, since it is larger than the sum of its proper divisors (1).

9929681947 is an equidigital number, since it uses as much as digits as its factorization.

9929681947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 64.

The square root of 9929681947 is about 99647.7894737259. The cubic root of 9929681947 is about 2149.3729519507.

The spelling of 9929681947 in words is "nine billion, nine hundred twenty-nine million, six hundred eighty-one thousand, nine hundred forty-seven".