2111261209 has 6 divisors (see below), whose sum is σ = 2228228970. Its totient is φ = 2000141856.

The previous prime is 2111261177. The next prime is 2111261213. The reversal of 2111261209 is 9021621112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2100205584 + 11055625 = 45828^2 + 3325^2 .

It is not a de Polignac number, because 2111261209 - 2⁵ = 2111261177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111267209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2923824 + ... + 2924545.

It is an arithmetic number, because the mean of its divisors is an integer number (371371495).

Almost surely, 2^2111261209 is an apocalyptic number.

It is an amenable number.

2111261209 is a deficient number, since it is larger than the sum of its proper divisors (116967761).

2111261209 is an equidigital number, since it uses as much as digits as its factorization.

2111261209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5848407 (or 5848388 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 2111261209 is about 45948.4625314058. The cubic root of 2111261209 is about 1282.8641124364.

The spelling of 2111261209 in words is "two billion, one hundred eleven million, two hundred sixty-one thousand, two hundred nine".