16191631091 has 2 divisors, whose sum is σ = 16191631092. Its totient is φ = 16191631090.

The previous prime is 16191631073. The next prime is 16191631121. The reversal of 16191631091 is 19013619161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16191631091 is a prime.

It is not a weakly prime, because it can be changed into another prime (16191631051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095815545 + 8095815546.

It is an arithmetic number, because the mean of its divisors is an integer number (8095815546).

Almost surely, 2^16191631091 is an apocalyptic number.

16191631091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191631091 is an equidigital number, since it uses as much as digits as its factorization.

16191631091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 16191631091 in words is "sixteen billion, one hundred ninety-one million, six hundred thirty-one thousand, ninety-one".