9640964591 has 4 divisors (see below), whose sum is σ = 10148383800. Its totient is φ = 9133545384.

The previous prime is 9640964549. The next prime is 9640964647. The reversal of 9640964591 is 1954690469.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1954690469 = 4409 ⋅443341.

It is a cyclic number.

It is not a de Polignac number, because 9640964591 - 2¹⁸ = 9640702447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640960591) 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, 253709576 + ... + 253709613.

It is an arithmetic number, because the mean of its divisors is an integer number (2537095950).

Almost surely, 2^9640964591 is an apocalyptic number.

9640964591 is a deficient number, since it is larger than the sum of its proper divisors (507419209).

9640964591 is a wasteful number, since it uses less digits than its factorization.

9640964591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507419208.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 9640964591 is about 98188.4137309489. The cubic root of 9640964591 is about 2128.3358607126.

The spelling of 9640964591 in words is "nine billion, six hundred forty million, nine hundred sixty-four thousand, five hundred ninety-one".