6121756609 has 2 divisors, whose sum is σ = 6121756610. Its totient is φ = 6121756608.

The previous prime is 6121756601. The next prime is 6121756637. The reversal of 6121756609 is 9066571216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5877522225 + 244234384 = 76665^2 + 15628^2 .

It is a cyclic number.

It is not a de Polignac number, because 6121756609 - 2³ = 6121756601 is a prime.

It is not a weakly prime, because it can be changed into another prime (6121756601) 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 as a sum of consecutive naturals, namely, 3060878304 + 3060878305.

It is an arithmetic number, because the mean of its divisors is an integer number (3060878305).

Almost surely, 2^6121756609 is an apocalyptic number.

It is an amenable number.

6121756609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6121756609 is an equidigital number, since it uses as much as digits as its factorization.

6121756609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 6121756609 is about 78241.6552036062. The cubic root of 6121756609 is about 1829.3298439977.

The spelling of 6121756609 in words is "six billion, one hundred twenty-one million, seven hundred fifty-six thousand, six hundred nine".