109778551 has 4 divisors (see below), whose sum is σ = 110169504. Its totient is φ = 109387600.

The previous prime is 109778521. The next prime is 109778569. The reversal of 109778551 is 155877901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155877901 = 83 ⋅1878047.

It is a cyclic number.

It is not a de Polignac number, because 109778551 - 2¹¹ = 109776503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109778498 and 109778507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109778521) 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, 195055 + ... + 195616.

It is an arithmetic number, because the mean of its divisors is an integer number (27542376).

Almost surely, 2^109778551 is an apocalyptic number.

109778551 is a deficient number, since it is larger than the sum of its proper divisors (390953).

109778551 is an equidigital number, since it uses as much as digits as its factorization.

109778551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390952.

The product of its (nonzero) digits is 88200, while the sum is 43.

The square root of 109778551 is about 10477.5259961500. The cubic root of 109778551 is about 478.8202378389.

The spelling of 109778551 in words is "one hundred nine million, seven hundred seventy-eight thousand, five hundred fifty-one".