6136721 has 2 divisors, whose sum is σ = 6136722. Its totient is φ = 6136720.

The previous prime is 6136717. The next prime is 6136723. The reversal of 6136721 is 1276316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5013121 + 1123600 = 2239^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 6136721 - 2² = 6136717 is a prime.

Together with 6136723, 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 (6136723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3068360 + 3068361.

It is an arithmetic number, because the mean of its divisors is an integer number (3068361).

Almost surely, 2^6136721 is an apocalyptic number.

It is an amenable number.

6136721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6136721 is an equidigital number, since it uses as much as digits as its factorization.

6136721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 6136721 is about 2477.2406019602. The cubic root of 6136721 is about 183.0819205821.

The spelling of 6136721 in words is "six million, one hundred thirty-six thousand, seven hundred twenty-one".