2209009381 has 4 divisors (see below), whose sum is σ = 2209424832. Its totient is φ = 2208593932.

The previous prime is 2209009349. The next prime is 2209009399. The reversal of 2209009381 is 1839009022.

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 2209009381 - 2⁵ = 2209009349 is a prime.

It is a super-2 number, since 2×2209009381² = 9759444890692006322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209009301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199645 + ... + 210418.

It is an arithmetic number, because the mean of its divisors is an integer number (552356208).

Almost surely, 2^2209009381 is an apocalyptic number.

It is an amenable number.

2209009381 is a deficient number, since it is larger than the sum of its proper divisors (415451).

2209009381 is an equidigital number, since it uses as much as digits as its factorization.

2209009381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415450.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 2209009381 is about 47000.0997977664. The cubic root of 2209009381 is about 1302.3644112552.

The spelling of 2209009381 in words is "two billion, two hundred nine million, nine thousand, three hundred eighty-one".