7685134981 has 2 divisors, whose sum is σ = 7685134982. Its totient is φ = 7685134980.

The previous prime is 7685134943. The next prime is 7685135023. The reversal of 7685134981 is 1894315867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4656834081 + 3028300900 = 68241^2 + 55030^2 .

It is an emirp because it is prime and its reverse (1894315867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7685134981 - 2¹³ = 7685126789 is a prime.

It is a super-2 number, since 2×7685134981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7685134481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3842567490 + 3842567491.

It is an arithmetic number, because the mean of its divisors is an integer number (3842567491).

Almost surely, 2^7685134981 is an apocalyptic number.

It is an amenable number.

7685134981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7685134981 is an equidigital number, since it uses as much as digits as its factorization.

7685134981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 52.

The square root of 7685134981 is about 87664.9016482651. The cubic root of 7685134981 is about 1973.4092820597.

The spelling of 7685134981 in words is "seven billion, six hundred eighty-five million, one hundred thirty-four thousand, nine hundred eighty-one".