108784157891 has 4 divisors (see below), whose sum is σ = 111314022072. Its totient is φ = 106254293712.

The previous prime is 108784157861. The next prime is 108784157929. The reversal of 108784157891 is 198751487801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198751487801 = 86677 ⋅2293013.

It is a cyclic number.

It is not a de Polignac number, because 108784157891 - 2¹⁴ = 108784141507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108784157891.

It is not an unprimeable number, because it can be changed into a prime (108784157821) 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, 1264932026 + ... + 1264932111.

It is an arithmetic number, because the mean of its divisors is an integer number (27828505518).

Almost surely, 2^108784157891 is an apocalyptic number.

108784157891 is a deficient number, since it is larger than the sum of its proper divisors (2529864181).

108784157891 is an equidigital number, since it uses as much as digits as its factorization.

108784157891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529864180.

The product of its (nonzero) digits is 4515840, while the sum is 59.

The spelling of 108784157891 in words is "one hundred eight billion, seven hundred eighty-four million, one hundred fifty-seven thousand, eight hundred ninety-one".