989100493 has 2 divisors, whose sum is σ = 989100494. Its totient is φ = 989100492.

The previous prime is 989100481. The next prime is 989100529. The reversal of 989100493 is 394001989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988662249 + 438244 = 31443^2 + 662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989100493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989100193) 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, 494550246 + 494550247.

It is an arithmetic number, because the mean of its divisors is an integer number (494550247).

Almost surely, 2^989100493 is an apocalyptic number.

It is an amenable number.

989100493 is a deficient number, since it is larger than the sum of its proper divisors (1).

989100493 is an equidigital number, since it uses as much as digits as its factorization.

989100493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 989100493 is about 31449.9680921937. The cubic root of 989100493 is about 996.3535505683.

The spelling of 989100493 in words is "nine hundred eighty-nine million, one hundred thousand, four hundred ninety-three".