9744641521 has 4 divisors (see below), whose sum is σ = 9747430000. Its totient is φ = 9741853044.

The previous prime is 9744641513. The next prime is 9744641527. The reversal of 9744641521 is 1251464479.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9744641521 - 2³ = 9744641513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9744641527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388991 + ... + 1395988.

It is an arithmetic number, because the mean of its divisors is an integer number (2436857500).

Almost surely, 2^9744641521 is an apocalyptic number.

It is an amenable number.

9744641521 is a deficient number, since it is larger than the sum of its proper divisors (2788479).

9744641521 is a wasteful number, since it uses less digits than its factorization.

9744641521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788478.

The product of its digits is 241920, while the sum is 43.

The square root of 9744641521 is about 98714.9508483897. The cubic root of 9744641521 is about 2135.9379024325.

The spelling of 9744641521 in words is "nine billion, seven hundred forty-four million, six hundred forty-one thousand, five hundred twenty-one".