7311728639 has 2 divisors, whose sum is σ = 7311728640. Its totient is φ = 7311728638.

The previous prime is 7311728623. The next prime is 7311728647. The reversal of 7311728639 is 9368271137.

It is a strong prime.

It is an emirp because it is prime and its reverse (9368271137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7311728639 - 2⁴ = 7311728623 is a prime.

It is a super-2 number, since 2×7311728639² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 7311728593 and 7311728602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7311728689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3655864319 + 3655864320.

It is an arithmetic number, because the mean of its divisors is an integer number (3655864320).

Almost surely, 2^7311728639 is an apocalyptic number.

7311728639 is a deficient number, since it is larger than the sum of its proper divisors (1).

7311728639 is an equidigital number, since it uses as much as digits as its factorization.

7311728639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 7311728639 is about 85508.6465744839. The cubic root of 7311728639 is about 1940.9157683597.

The spelling of 7311728639 in words is "seven billion, three hundred eleven million, seven hundred twenty-eight thousand, six hundred thirty-nine".