2111686261 has 4 divisors (see below), whose sum is σ = 2151529452. Its totient is φ = 2071843072.

The previous prime is 2111686253. The next prime is 2111686271. The reversal of 2111686261 is 1626861112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1235171025 + 876515236 = 35145^2 + 29606^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111686261 - 2³ = 2111686253 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 (2111686211) 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, 19921516 + ... + 19921621.

It is an arithmetic number, because the mean of its divisors is an integer number (537882363).

Almost surely, 2^2111686261 is an apocalyptic number.

It is an amenable number.

2111686261 is a deficient number, since it is larger than the sum of its proper divisors (39843191).

2111686261 is an equidigital number, since it uses as much as digits as its factorization.

2111686261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39843190.

The product of its digits is 6912, while the sum is 34.

The square root of 2111686261 is about 45953.0876111715. The cubic root of 2111686261 is about 1282.9501980054.

The spelling of 2111686261 in words is "two billion, one hundred eleven million, six hundred eighty-six thousand, two hundred sixty-one".