9640002991 has 4 divisors (see below), whose sum is σ = 9645044112. Its totient is φ = 9634961872.

The previous prime is 9640002989. The next prime is 9640003003. The reversal of 9640002991 is 1992000469.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1992000469 = 3539 ⋅562871.

It is a cyclic number.

It is not a de Polignac number, because 9640002991 - 2¹ = 9640002989 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640002901) 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, 2517691 + ... + 2521516.

It is an arithmetic number, because the mean of its divisors is an integer number (2411261028).

Almost surely, 2^9640002991 is an apocalyptic number.

9640002991 is a deficient number, since it is larger than the sum of its proper divisors (5041121).

9640002991 is a wasteful number, since it uses less digits than its factorization.

9640002991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5041120.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 9640002991 is about 98183.5169007507. The cubic root of 9640002991 is about 2128.2650975370.

The spelling of 9640002991 in words is "nine billion, six hundred forty million, two thousand, nine hundred ninety-one".