5157946721 has 2 divisors, whose sum is σ = 5157946722. Its totient is φ = 5157946720.

The previous prime is 5157946711. The next prime is 5157946723. The reversal of 5157946721 is 1276497515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2971449121 + 2186497600 = 54511^2 + 46760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5157946721 is a prime.

It is a Sophie Germain prime.

Together with 5157946723, 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 (5157946723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2578973360 + 2578973361.

It is an arithmetic number, because the mean of its divisors is an integer number (2578973361).

Almost surely, 2^5157946721 is an apocalyptic number.

It is an amenable number.

5157946721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5157946721 is an equidigital number, since it uses as much as digits as its factorization.

5157946721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 47.

The square root of 5157946721 is about 71818.8465585462. The cubic root of 5157946721 is about 1727.7952826440.

The spelling of 5157946721 in words is "five billion, one hundred fifty-seven million, nine hundred forty-six thousand, seven hundred twenty-one".