9994835654521 has 3 divisors (see below), whose sum is σ = 9994838815983. Its totient is φ = 9994832493060.

The previous prime is 9994835654477. The next prime is 9994835654623. The reversal of 9994835654521 is 1254565384999.

It is a happy number.

The square root of 9994835654521 is 3161461.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9636920626921 + 357915027600 = 3104339^2 + 598260^2 .

It is not a de Polignac number, because 9994835654521 - 2⁹ = 9994835654009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9994835054521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1580731 + ... + 4742191.

It is an arithmetic number, because the mean of its divisors is an integer number (3331612938661).

Almost surely, 2^{9994835654521} is an apocalyptic number.

9994835654521 is the 3161461-st square number.

9994835654521 is the 1580731-st centered octagonal number.

It is an amenable number.

9994835654521 is a deficient number, since it is larger than the sum of its proper divisors (3161462).

9994835654521 is an frugal number, since it uses more digits than its factorization.

9994835654521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322922 (or 3161461 counting only the distinct ones).

The product of its digits is 419904000, while the sum is 70.

The spelling of 9994835654521 in words is "nine trillion, nine hundred ninety-four billion, eight hundred thirty-five million, six hundred fifty-four thousand, five hundred twenty-one".