2209230781 has 2 divisors, whose sum is σ = 2209230782. Its totient is φ = 2209230780.

The previous prime is 2209230773. The next prime is 2209230787. The reversal of 2209230781 is 1870329022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1921419556 + 287811225 = 43834^2 + 16965^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209230781 - 2³ = 2209230773 is a prime.

It is a super-2 number, since 2×2209230781² = 9761401287435739922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2209230787) 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 as a sum of consecutive naturals, namely, 1104615390 + 1104615391.

It is an arithmetic number, because the mean of its divisors is an integer number (1104615391).

Almost surely, 2^2209230781 is an apocalyptic number.

It is an amenable number.

2209230781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2209230781 is an equidigital number, since it uses as much as digits as its factorization.

2209230781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 2209230781 is about 47002.4550529012. The cubic root of 2209230781 is about 1302.4079200259.

The spelling of 2209230781 in words is "two billion, two hundred nine million, two hundred thirty thousand, seven hundred eighty-one".