9981408651 has 16 divisors (see below), whose sum is σ = 13583894400. Its totient is φ = 6517995968.

The previous prime is 9981408623. The next prime is 9981408667. The reversal of 9981408651 is 1568041899.

It is a cyclic number.

It is not a de Polignac number, because 9981408651 - 2¹⁰ = 9981407627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9981408594 and 9981408603.

It is not an unprimeable number, because it can be changed into a prime (9981406651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146121 + ... + 203258.

It is an arithmetic number, because the mean of its divisors is an integer number (848993400).

Almost surely, 2^9981408651 is an apocalyptic number.

9981408651 is a deficient number, since it is larger than the sum of its proper divisors (3602485749).

9981408651 is a wasteful number, since it uses less digits than its factorization.

9981408651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349578.

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 9981408651 is about 99907.0000100093. Note that the first 4 decimals coincide. The cubic root of 9981408651 is about 2153.0987335411.

The spelling of 9981408651 in words is "nine billion, nine hundred eighty-one million, four hundred eight thousand, six hundred fifty-one".