5116387721 has 2 divisors, whose sum is σ = 5116387722. Its totient is φ = 5116387720.

The previous prime is 5116387687. The next prime is 5116387751. The reversal of 5116387721 is 1277836115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3384912400 + 1731475321 = 58180^2 + 41611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5116387721 is a prime.

It is not a weakly prime, because it can be changed into another prime (5116387751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2558193860 + 2558193861.

It is an arithmetic number, because the mean of its divisors is an integer number (2558193861).

Almost surely, 2^5116387721 is an apocalyptic number.

It is an amenable number.

5116387721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5116387721 is an equidigital number, since it uses as much as digits as its factorization.

5116387721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 5116387721 is about 71528.9292594262. The cubic root of 5116387721 is about 1723.1423223312.

The spelling of 5116387721 in words is "five billion, one hundred sixteen million, three hundred eighty-seven thousand, seven hundred twenty-one".