9998984551 has 2 divisors, whose sum is σ = 9998984552. Its totient is φ = 9998984550.

The previous prime is 9998984533. The next prime is 9998984561. The reversal of 9998984551 is 1554898999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9998984551 - 2³¹ = 7851500903 is a prime.

It is a super-2 number, since 2×9998984551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998984521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999492275 + 4999492276.

It is an arithmetic number, because the mean of its divisors is an integer number (4999492276).

Almost surely, 2^9998984551 is an apocalyptic number.

9998984551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998984551 is an equidigital number, since it uses as much as digits as its factorization.

9998984551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41990400, while the sum is 67.

The square root of 9998984551 is about 99994.9226261014. The cubic root of 9998984551 is about 2154.3617636117.

The spelling of 9998984551 in words is "nine billion, nine hundred ninety-eight million, nine hundred eighty-four thousand, five hundred fifty-one".