6140638991 has 2 divisors, whose sum is σ = 6140638992. Its totient is φ = 6140638990.

The previous prime is 6140638981. The next prime is 6140639033. The reversal of 6140638991 is 1998360416.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6140638991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6140638981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3070319495 + 3070319496.

It is an arithmetic number, because the mean of its divisors is an integer number (3070319496).

Almost surely, 2^6140638991 is an apocalyptic number.

6140638991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6140638991 is an equidigital number, since it uses as much as digits as its factorization.

6140638991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 6140638991 is about 78362.2293646627. The cubic root of 6140638991 is about 1831.2087519184.

The spelling of 6140638991 in words is "six billion, one hundred forty million, six hundred thirty-eight thousand, nine hundred ninety-one".