989091539 has 4 divisors (see below), whose sum is σ = 989675400. Its totient is φ = 988507680.

The previous prime is 989091473. The next prime is 989091541. The reversal of 989091539 is 935190989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935190989 = 53 ⋅17645113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989091539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989096539) 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, 289382 + ... + 292779.

It is an arithmetic number, because the mean of its divisors is an integer number (247418850).

Almost surely, 2^989091539 is an apocalyptic number.

989091539 is a deficient number, since it is larger than the sum of its proper divisors (583861).

989091539 is a wasteful number, since it uses less digits than its factorization.

989091539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583860.

The product of its (nonzero) digits is 787320, while the sum is 53.

The square root of 989091539 is about 31449.8257387859. The cubic root of 989091539 is about 996.3505440061.

The spelling of 989091539 in words is "nine hundred eighty-nine million, ninety-one thousand, five hundred thirty-nine".