9906623989 has 2 divisors, whose sum is σ = 9906623990. Its totient is φ = 9906623988.

The previous prime is 9906623977. The next prime is 9906624001. The reversal of 9906623989 is 9893266099.

It is a balanced prime because it is at equal distance from previous prime (9906623977) and next prime (9906624001).

It can be written as a sum of positive squares in only one way, i.e., 9112229764 + 794394225 = 95458^2 + 28185^2 .

It is an emirp because it is prime and its reverse (9893266099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9906623989 - 2⁵ = 9906623957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9906623939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4953311994 + 4953311995.

It is an arithmetic number, because the mean of its divisors is an integer number (4953311995).

Almost surely, 2^9906623989 is an apocalyptic number.

It is an amenable number.

9906623989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9906623989 is an equidigital number, since it uses as much as digits as its factorization.

9906623989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11337408, while the sum is 61.

The square root of 9906623989 is about 99532.0249417242. The cubic root of 9906623989 is about 2147.7079586274.

The spelling of 9906623989 in words is "nine billion, nine hundred six million, six hundred twenty-three thousand, nine hundred eighty-nine".