38509191491 has 2 divisors, whose sum is σ = 38509191492. Its totient is φ = 38509191490.

The previous prime is 38509191463. The next prime is 38509191533. The reversal of 38509191491 is 19419190583.

38509191491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38509191491 is a prime.

It is not a weakly prime, because it can be changed into another prime (38509191451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19254595745 + 19254595746.

It is an arithmetic number, because the mean of its divisors is an integer number (19254595746).

Almost surely, 2^38509191491 is an apocalyptic number.

38509191491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38509191491 is an equidigital number, since it uses as much as digits as its factorization.

38509191491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 38509191491 in words is "thirty-eight billion, five hundred nine million, one hundred ninety-one thousand, four hundred ninety-one".