988491999839 has 2 divisors, whose sum is σ = 988491999840. Its totient is φ = 988491999838.

The previous prime is 988491999829. The next prime is 988491999877. The reversal of 988491999839 is 938999194889.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988491999839 is a prime.

It is a super-3 number, since 3×988491999839³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988491999809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494245999919 + 494245999920.

It is an arithmetic number, because the mean of its divisors is an integer number (494245999920).

Almost surely, 2^988491999839 is an apocalyptic number.

988491999839 is a deficient number, since it is larger than the sum of its proper divisors (1).

988491999839 is an equidigital number, since it uses as much as digits as its factorization.

988491999839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265173504, while the sum is 86.

The spelling of 988491999839 in words is "nine hundred eighty-eight billion, four hundred ninety-one million, nine hundred ninety-nine thousand, eight hundred thirty-nine".