9806954521 has 24 divisors (see below), whose sum is σ = 12819812544. Its totient is φ = 7421974560.

The previous prime is 9806954497. The next prime is 9806954527. The reversal of 9806954521 is 1254596089.

It is not a de Polignac number, because 9806954521 - 2¹³ = 9806946329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (9806954527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320035 + ... + 349336.

It is an arithmetic number, because the mean of its divisors is an integer number (534158856).

Almost surely, 2^9806954521 is an apocalyptic number.

9806954521 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9806954521 is a deficient number, since it is larger than the sum of its proper divisors (3012858023).

9806954521 is a wasteful number, since it uses less digits than its factorization.

9806954521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669421 (or 669414 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The square root of 9806954521 is about 99030.0687720654. The cubic root of 9806954521 is about 2140.4810489452.

The spelling of 9806954521 in words is "nine billion, eight hundred six million, nine hundred fifty-four thousand, five hundred twenty-one".