9999998783 has 2 divisors, whose sum is σ = 9999998784. Its totient is φ = 9999998782.

The previous prime is 9999998731. The next prime is 9999998821. The reversal of 9999998783 is 3878999999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999998783 - 2³² = 5705031487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9999998698 and 9999998707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999998083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999999391 + 4999999392.

It is an arithmetic number, because the mean of its divisors is an integer number (4999999392).

Almost surely, 2^9999998783 is an apocalyptic number.

9999998783 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999998783 is an equidigital number, since it uses as much as digits as its factorization.

9999998783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714256704, while the sum is 80.

The square root of 9999998783 is about 99999.9939149998. The cubic root of 9999998783 is about 2154.4346026336.

The spelling of 9999998783 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, seven hundred eighty-three".