8487568381 has 2 divisors, whose sum is σ = 8487568382. Its totient is φ = 8487568380.

The previous prime is 8487568361. The next prime is 8487568387. The reversal of 8487568381 is 1838657848.

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., 5618252025 + 2869316356 = 74955^2 + 53566^2 .

It is a cyclic number.

It is not a de Polignac number, because 8487568381 - 2²¹ = 8485471229 is a prime.

It is a super-2 number, since 2×8487568381² (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 (8487568387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4243784190 + 4243784191.

It is an arithmetic number, because the mean of its divisors is an integer number (4243784191).

Almost surely, 2^8487568381 is an apocalyptic number.

It is an amenable number.

8487568381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8487568381 is an equidigital number, since it uses as much as digits as its factorization.

8487568381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10321920, while the sum is 58.

The square root of 8487568381 is about 92127.9999837183. Note that the first 4 decimals coincide. The cubic root of 8487568381 is about 2039.8321325569.

The spelling of 8487568381 in words is "eight billion, four hundred eighty-seven million, five hundred sixty-eight thousand, three hundred eighty-one".