2211638959 has 4 divisors (see below), whose sum is σ = 2216631816. Its totient is φ = 2206646104.

The previous prime is 2211638939. The next prime is 2211638993. The reversal of 2211638959 is 9598361122.

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 2211638959 - 2⁷ = 2211638831 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 (2211638939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495764 + ... + 2496649.

It is an arithmetic number, because the mean of its divisors is an integer number (554157954).

Almost surely, 2^2211638959 is an apocalyptic number.

2211638959 is a deficient number, since it is larger than the sum of its proper divisors (4992857).

2211638959 is an equidigital number, since it uses as much as digits as its factorization.

2211638959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992856.

The product of its digits is 233280, while the sum is 46.

The square root of 2211638959 is about 47028.0656523315. The cubic root of 2211638959 is about 1302.8809792753.

It can be divided in two parts, 22116 and 38959, that added together give a triangular number (61075 = T₃₄₉).

The spelling of 2211638959 in words is "two billion, two hundred eleven million, six hundred thirty-eight thousand, nine hundred fifty-nine".