8387806961 has 2 divisors, whose sum is σ = 8387806962. Its totient is φ = 8387806960.

The previous prime is 8387806901. The next prime is 8387806979. The reversal of 8387806961 is 1696087838.

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., 8312880625 + 74926336 = 91175^2 + 8656^2 .

It is a cyclic number.

It is not a de Polignac number, because 8387806961 - 2¹⁴ = 8387790577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8387806897 and 8387806906.

It is not a weakly prime, because it can be changed into another prime (8387806901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4193903480 + 4193903481.

It is an arithmetic number, because the mean of its divisors is an integer number (4193903481).

Almost surely, 2^8387806961 is an apocalyptic number.

It is an amenable number.

8387806961 is a deficient number, since it is larger than the sum of its proper divisors (1).

8387806961 is an equidigital number, since it uses as much as digits as its factorization.

8387806961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The square root of 8387806961 is about 91584.9712616650. The cubic root of 8387806961 is about 2031.8086690582.

The spelling of 8387806961 in words is "eight billion, three hundred eighty-seven million, eight hundred six thousand, nine hundred sixty-one".