6135721169 has 2 divisors, whose sum is σ = 6135721170. Its totient is φ = 6135721168.

The previous prime is 6135721147. The next prime is 6135721171. The reversal of 6135721169 is 9611275316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6131673025 + 4048144 = 78305^2 + 2012^2 .

It is a cyclic number.

It is not a de Polignac number, because 6135721169 - 2¹² = 6135717073 is a prime.

It is a super-2 number, since 2×6135721169² = 75294148527429453122, which contains 22 as substring.

Together with 6135721171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6135721199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3067860584 + 3067860585.

It is an arithmetic number, because the mean of its divisors is an integer number (3067860585).

Almost surely, 2^6135721169 is an apocalyptic number.

It is an amenable number.

6135721169 is a deficient number, since it is larger than the sum of its proper divisors (1).

6135721169 is an equidigital number, since it uses as much as digits as its factorization.

6135721169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 6135721169 is about 78330.8443015904. The cubic root of 6135721169 is about 1830.7197711109.

The spelling of 6135721169 in words is "six billion, one hundred thirty-five million, seven hundred twenty-one thousand, one hundred sixty-nine".