2109772811 has 4 divisors (see below), whose sum is σ = 2233877112. Its totient is φ = 1985668512.

The previous prime is 2109772807. The next prime is 2109772813. The reversal of 2109772811 is 1182779012.

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 2109772811 - 2² = 2109772807 is a prime.

It is a super-2 number, since 2×2109772811² = 8902282628069683442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2109772813) 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, 62052125 + ... + 62052158.

It is an arithmetic number, because the mean of its divisors is an integer number (558469278).

Almost surely, 2^2109772811 is an apocalyptic number.

2109772811 is a deficient number, since it is larger than the sum of its proper divisors (124104301).

2109772811 is a wasteful number, since it uses less digits than its factorization.

2109772811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124104300.

The product of its (nonzero) digits is 14112, while the sum is 38.

The square root of 2109772811 is about 45932.2632906327. The cubic root of 2109772811 is about 1282.5625768351.

The spelling of 2109772811 in words is "two billion, one hundred nine million, seven hundred seventy-two thousand, eight hundred eleven".