8452321781 has 2 divisors, whose sum is σ = 8452321782. Its totient is φ = 8452321780.

The previous prime is 8452321777. The next prime is 8452321837. The reversal of 8452321781 is 1871232548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6223632100 + 2228689681 = 78890^2 + 47209^2 .

It is a cyclic number.

It is not a de Polignac number, because 8452321781 - 2² = 8452321777 is a prime.

It is a super-2 number, since 2×8452321781² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8452321081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4226160890 + 4226160891.

It is an arithmetic number, because the mean of its divisors is an integer number (4226160891).

Almost surely, 2^8452321781 is an apocalyptic number.

It is an amenable number.

8452321781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8452321781 is an equidigital number, since it uses as much as digits as its factorization.

8452321781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 41.

The square root of 8452321781 is about 91936.5095106400. The cubic root of 8452321781 is about 2037.0045892818.

The spelling of 8452321781 in words is "eight billion, four hundred fifty-two million, three hundred twenty-one thousand, seven hundred eighty-one".