2221091309 has 4 divisors (see below), whose sum is σ = 2221216704. Its totient is φ = 2220965916.

The previous prime is 2221091287. The next prime is 2221091311. The reversal of 2221091309 is 9031901222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2221091309 - 2¹⁶ = 2221025773 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 (2221091329) 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, 30677 + ... + 73370.

It is an arithmetic number, because the mean of its divisors is an integer number (555304176).

Almost surely, 2^2221091309 is an apocalyptic number.

It is an amenable number.

2221091309 is a deficient number, since it is larger than the sum of its proper divisors (125395).

2221091309 is a wasteful number, since it uses less digits than its factorization.

2221091309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125394.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2221091309 is about 47128.4554064739. The cubic root of 2221091309 is about 1304.7344740477.

The spelling of 2221091309 in words is "two billion, two hundred twenty-one million, ninety-one thousand, three hundred nine".