989439091 has 4 divisors (see below), whose sum is σ = 999639592. Its totient is φ = 979238592.

The previous prime is 989439053. The next prime is 989439133. The reversal of 989439091 is 190934989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 989439091 - 2⁹ = 989438579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989449091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100105 + ... + 5100298.

It is an arithmetic number, because the mean of its divisors is an integer number (249909898).

Almost surely, 2^989439091 is an apocalyptic number.

989439091 is a deficient number, since it is larger than the sum of its proper divisors (10200501).

989439091 is a wasteful number, since it uses less digits than its factorization.

989439091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200500.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 989439091 is about 31455.3507530913. The cubic root of 989439091 is about 996.4672312418.

The spelling of 989439091 in words is "nine hundred eighty-nine million, four hundred thirty-nine thousand, ninety-one".