1109877791 has 4 divisors (see below), whose sum is σ = 1210775784. Its totient is φ = 1008979800.

The previous prime is 1109877781. The next prime is 1109877803. The reversal of 1109877791 is 1977789011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1977789011 = 11 ⋅179799001.

It is a cyclic number.

It is not a de Polignac number, because 1109877791 - 2²⁶ = 1042768927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109877781) 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, 50448980 + ... + 50449001.

It is an arithmetic number, because the mean of its divisors is an integer number (302693946).

Almost surely, 2^1109877791 is an apocalyptic number.

1109877791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1109877791 is a deficient number, since it is larger than the sum of its proper divisors (100897993).

1109877791 is a wasteful number, since it uses less digits than its factorization.

1109877791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100897992.

The product of its (nonzero) digits is 222264, while the sum is 50.

The square root of 1109877791 is about 33314.8283951756. The cubic root of 1109877791 is about 1035.3608055395.

The spelling of 1109877791 in words is "one billion, one hundred nine million, eight hundred seventy-seven thousand, seven hundred ninety-one".