388109499091 has 4 divisors (see below), whose sum is σ = 400629160384. Its totient is φ = 375589837800.

The previous prime is 388109499049. The next prime is 388109499119. The reversal of 388109499091 is 190994901883.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 388109499091 - 2¹¹ = 388109497043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388109493091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6259830600 + ... + 6259830661.

It is an arithmetic number, because the mean of its divisors is an integer number (100157290096).

Almost surely, 2^388109499091 is an apocalyptic number.

388109499091 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

388109499091 is a deficient number, since it is larger than the sum of its proper divisors (12519661293).

388109499091 is a wasteful number, since it uses less digits than its factorization.

388109499091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12519661292.

The product of its (nonzero) digits is 5038848, while the sum is 61.

The spelling of 388109499091 in words is "three hundred eighty-eight billion, one hundred nine million, four hundred ninety-nine thousand, ninety-one".