8581123267391 has 2 divisors, whose sum is σ = 8581123267392. Its totient is φ = 8581123267390.

The previous prime is 8581123267201. The next prime is 8581123267403. The reversal of 8581123267391 is 1937623211858.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8581123267391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8581123264391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4290561633695 + 4290561633696.

It is an arithmetic number, because the mean of its divisors is an integer number (4290561633696).

Almost surely, 2^{8581123267391} is an apocalyptic number.

8581123267391 is a deficient number, since it is larger than the sum of its proper divisors (1).

8581123267391 is an equidigital number, since it uses as much as digits as its factorization.

8581123267391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The spelling of 8581123267391 in words is "eight trillion, five hundred eighty-one billion, one hundred twenty-three million, two hundred sixty-seven thousand, three hundred ninety-one".