9643497381 has 72 divisors (see below), whose sum is σ = 16594250400. Its totient is φ = 5379151680.

The previous prime is 9643497337. The next prime is 9643497421. The reversal of 9643497381 is 1837943469.

It is a happy number.

9643497381 is a `hidden beast` number, since 96 + 434 + 97 + 38 + 1 = 666.

It is not a de Polignac number, because 9643497381 - 2¹³ = 9643489189 is a prime.

It is a super-2 number, since 2×9643497381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9643493381) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3737950 + ... + 3740528.

It is an arithmetic number, because the mean of its divisors is an integer number (230475700).

Almost surely, 2^9643497381 is an apocalyptic number.

It is an amenable number.

9643497381 is a deficient number, since it is larger than the sum of its proper divisors (6950753019).

9643497381 is a wasteful number, since it uses less digits than its factorization.

9643497381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799 (or 2789 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 9643497381 is about 98201.3104851458. The cubic root of 9643497381 is about 2128.5222236622.

The spelling of 9643497381 in words is "nine billion, six hundred forty-three million, four hundred ninety-seven thousand, three hundred eighty-one".