881439393491 has 2 divisors, whose sum is σ = 881439393492. Its totient is φ = 881439393490.

The previous prime is 881439393473. The next prime is 881439393553. The reversal of 881439393491 is 194393934188.

It is an a-pointer prime, because the next prime (881439393553) can be obtained adding 881439393491 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 881439393491 - 2¹⁰ = 881439392467 is a prime.

It is not a weakly prime, because it can be changed into another prime (881439396491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440719696745 + 440719696746.

It is an arithmetic number, because the mean of its divisors is an integer number (440719696746).

Almost surely, 2^881439393491 is an apocalyptic number.

881439393491 is a deficient number, since it is larger than the sum of its proper divisors (1).

881439393491 is an equidigital number, since it uses as much as digits as its factorization.

881439393491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 62.

The spelling of 881439393491 in words is "eight hundred eighty-one billion, four hundred thirty-nine million, three hundred ninety-three thousand, four hundred ninety-one".