9139418891 has 2 divisors, whose sum is σ = 9139418892. Its totient is φ = 9139418890.

The previous prime is 9139418867. The next prime is 9139418917. The reversal of 9139418891 is 1988149319.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9139418891 is a prime.

It is not a weakly prime, because it can be changed into another prime (9139418831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569709445 + 4569709446.

It is an arithmetic number, because the mean of its divisors is an integer number (4569709446).

Almost surely, 2^9139418891 is an apocalyptic number.

9139418891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9139418891 is an equidigital number, since it uses as much as digits as its factorization.

9139418891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 53.

The square root of 9139418891 is about 95600.3080068260. The cubic root of 9139418891 is about 2090.7696844629.

The spelling of 9139418891 in words is "nine billion, one hundred thirty-nine million, four hundred eighteen thousand, eight hundred ninety-one".