989010091 has 2 divisors, whose sum is σ = 989010092. Its totient is φ = 989010090.

The previous prime is 989010067. The next prime is 989010101. The reversal of 989010091 is 190010989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989010091 - 2¹³ = 989001899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989010091.

It is not a weakly prime, because it can be changed into another prime (989010791) 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 as a sum of consecutive naturals, namely, 494505045 + 494505046.

It is an arithmetic number, because the mean of its divisors is an integer number (494505046).

Almost surely, 2^989010091 is an apocalyptic number.

989010091 is a deficient number, since it is larger than the sum of its proper divisors (1).

989010091 is an equidigital number, since it uses as much as digits as its factorization.

989010091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 989010091 is about 31448.5308241895. The cubic root of 989010091 is about 996.3231946714.

The spelling of 989010091 in words is "nine hundred eighty-nine million, ten thousand, ninety-one".