8393364781 has 2 divisors, whose sum is σ = 8393364782. Its totient is φ = 8393364780.

The previous prime is 8393364773. The next prime is 8393364827. The reversal of 8393364781 is 1874633938.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5163715881 + 3229648900 = 71859^2 + 56830^2 .

It is a cyclic number.

It is not a de Polignac number, because 8393364781 - 2³ = 8393364773 is a prime.

It is a super-2 number, since 2×8393364781² (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 (8393304781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4196682390 + 4196682391.

It is an arithmetic number, because the mean of its divisors is an integer number (4196682391).

Almost surely, 2^8393364781 is an apocalyptic number.

It is an amenable number.

8393364781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8393364781 is an equidigital number, since it uses as much as digits as its factorization.

8393364781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 52.

The square root of 8393364781 is about 91615.3086607255. The cubic root of 8393364781 is about 2032.2573335573.

The spelling of 8393364781 in words is "eight billion, three hundred ninety-three million, three hundred sixty-four thousand, seven hundred eighty-one".