2109786755 has 4 divisors (see below), whose sum is σ = 2531744112. Its totient is φ = 1687829400.

The previous prime is 2109786739. The next prime is 2109786781. The reversal of 2109786755 is 5576879012.

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

It is not a de Polignac number, because 2109786755 - 2⁴ = 2109786739 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210978671 + ... + 210978680.

It is an arithmetic number, because the mean of its divisors is an integer number (632936028).

Almost surely, 2^2109786755 is an apocalyptic number.

2109786755 is a deficient number, since it is larger than the sum of its proper divisors (421957357).

2109786755 is an equidigital number, since it uses as much as digits as its factorization.

2109786755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421957356.

The product of its (nonzero) digits is 1058400, while the sum is 50.

The square root of 2109786755 is about 45932.4150791138. The cubic root of 2109786755 is about 1282.5654024179.

The spelling of 2109786755 in words is "two billion, one hundred nine million, seven hundred eighty-six thousand, seven hundred fifty-five".