989393917 has 2 divisors, whose sum is σ = 989393918. Its totient is φ = 989393916.

The previous prime is 989393869. The next prime is 989393989. The reversal of 989393917 is 719393989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806900836 + 182493081 = 28406^2 + 13509^2 .

It is an emirp because it is prime and its reverse (719393989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989393917 - 2⁷ = 989393789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989393417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494696958 + 494696959.

It is an arithmetic number, because the mean of its divisors is an integer number (494696959).

Almost surely, 2^989393917 is an apocalyptic number.

It is an amenable number.

989393917 is a deficient number, since it is larger than the sum of its proper divisors (1).

989393917 is an equidigital number, since it uses as much as digits as its factorization.

989393917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 58.

The square root of 989393917 is about 31454.6326794639. The cubic root of 989393917 is about 996.4520660516.

The spelling of 989393917 in words is "nine hundred eighty-nine million, three hundred ninety-three thousand, nine hundred seventeen".