9641620961281 has 8 divisors (see below), whose sum is σ = 10376132106024. Its totient is φ = 8925705035520.

The previous prime is 9641620961267. The next prime is 9641620961317. The reversal of 9641620961281 is 1821690261469.

It can be written as a sum of positive squares in 4 ways, for example, as 1903320992881 + 7738299968400 = 1379609^2 + 2781780^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9641620961281 - 2¹³ = 9641620953089 is a prime.

It is a super-2 number, since 2×9641620961281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9641620961201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4648803670 + ... + 4648805743.

It is an arithmetic number, because the mean of its divisors is an integer number (1297016513253).

Almost surely, 2^{9641620961281} is an apocalyptic number.

It is an amenable number.

9641620961281 is a deficient number, since it is larger than the sum of its proper divisors (734511144743).

9641620961281 is a wasteful number, since it uses less digits than its factorization.

9641620961281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9297609491.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 9641620961281 in words is "nine trillion, six hundred forty-one billion, six hundred twenty million, nine hundred sixty-one thousand, two hundred eighty-one".