988639391 has 2 divisors, whose sum is σ = 988639392. Its totient is φ = 988639390.

The previous prime is 988639381. The next prime is 988639397. The reversal of 988639391 is 193936889.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 988639391 - 2²⁶ = 921530527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988639397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494319695 + 494319696.

It is an arithmetic number, because the mean of its divisors is an integer number (494319696).

Almost surely, 2^988639391 is an apocalyptic number.

988639391 is a deficient number, since it is larger than the sum of its proper divisors (1).

988639391 is an equidigital number, since it uses as much as digits as its factorization.

988639391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 56.

The square root of 988639391 is about 31442.6365147708. The cubic root of 988639391 is about 996.1986987516.

The spelling of 988639391 in words is "nine hundred eighty-eight million, six hundred thirty-nine thousand, three hundred ninety-one".