988565993 has 4 divisors (see below), whose sum is σ = 1009599360. Its totient is φ = 967532628.

The previous prime is 988565971. The next prime is 988565999. The reversal of 988565993 is 399565889.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988565993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988565999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10516613 + ... + 10516706.

It is an arithmetic number, because the mean of its divisors is an integer number (252399840).

Almost surely, 2^988565993 is an apocalyptic number.

It is an amenable number.

988565993 is a deficient number, since it is larger than the sum of its proper divisors (21033367).

988565993 is a wasteful number, since it uses less digits than its factorization.

988565993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21033366.

The product of its digits is 20995200, while the sum is 62.

The square root of 988565993 is about 31441.4693199920. The cubic root of 988565993 is about 996.1740450702.

The spelling of 988565993 in words is "nine hundred eighty-eight million, five hundred sixty-five thousand, nine hundred ninety-three".