6111621809 has 2 divisors, whose sum is σ = 6111621810. Its totient is φ = 6111621808.

The previous prime is 6111621793. The next prime is 6111621811. The reversal of 6111621809 is 9081261116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4502007409 + 1609614400 = 67097^2 + 40120^2 .

It is a cyclic number.

It is not a de Polignac number, because 6111621809 - 2⁴ = 6111621793 is a prime.

It is a super-2 number, since 2×6111621809² = 74703842272488864962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 6111621811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6111621869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3055810904 + 3055810905.

It is an arithmetic number, because the mean of its divisors is an integer number (3055810905).

Almost surely, 2^6111621809 is an apocalyptic number.

It is an amenable number.

6111621809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6111621809 is an equidigital number, since it uses as much as digits as its factorization.

6111621809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 6111621809 is about 78176.8623634896. The cubic root of 6111621809 is about 1828.3197781037.

The spelling of 6111621809 in words is "six billion, one hundred eleven million, six hundred twenty-one thousand, eight hundred nine".