38919191091 has 32 divisors (see below), whose sum is σ = 57934103040. Its totient is φ = 23041670400.

The previous prime is 38919191057. The next prime is 38919191093. The reversal of 38919191091 is 19019191983.

It is not a de Polignac number, because 38919191091 - 2¹⁸ = 38918928947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38919191093) 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 in 31 ways as a sum of consecutive naturals, for example, 179191 + ... + 331583.

It is an arithmetic number, because the mean of its divisors is an integer number (1810440720).

Almost surely, 2^38919191091 is an apocalyptic number.

38919191091 is a deficient number, since it is larger than the sum of its proper divisors (19014911949).

38919191091 is a wasteful number, since it uses less digits than its factorization.

38919191091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152587.

The product of its (nonzero) digits is 157464, while the sum is 51.

The spelling of 38919191091 in words is "thirty-eight billion, nine hundred nineteen million, one hundred ninety-one thousand, ninety-one".