9640009931 has 2 divisors, whose sum is σ = 9640009932. Its totient is φ = 9640009930.

The previous prime is 9640009927. The next prime is 9640009979. The reversal of 9640009931 is 1399000469.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9640009931 - 2² = 9640009927 is a prime.

It is a super-2 number, since 2×9640009931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9640009901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820004965 + 4820004966.

It is an arithmetic number, because the mean of its divisors is an integer number (4820004966).

Almost surely, 2^9640009931 is an apocalyptic number.

9640009931 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640009931 is an equidigital number, since it uses as much as digits as its factorization.

9640009931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 9640009931 is about 98183.5522427255. The cubic root of 9640009931 is about 2128.2656082615.

The spelling of 9640009931 in words is "nine billion, six hundred forty million, nine thousand, nine hundred thirty-one".