8491204039 has 2 divisors, whose sum is σ = 8491204040. Its totient is φ = 8491204038.

The previous prime is 8491204021. The next prime is 8491204093. The reversal of 8491204039 is 9304021948.

Together with next prime (8491204093) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8491204039 - 2¹³ = 8491195847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8491203992 and 8491204010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8491204439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4245602019 + 4245602020.

It is an arithmetic number, because the mean of its divisors is an integer number (4245602020).

Almost surely, 2^8491204039 is an apocalyptic number.

8491204039 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491204039 is an equidigital number, since it uses as much as digits as its factorization.

8491204039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 8491204039 is about 92147.7294294330. The cubic root of 8491204039 is about 2040.1233456593.

The spelling of 8491204039 in words is "eight billion, four hundred ninety-one million, two hundred four thousand, thirty-nine".