989035981 has 8 divisors (see below), whose sum is σ = 1026790200. Its totient is φ = 951525120.

The previous prime is 989035969. The next prime is 989035987. The reversal of 989035981 is 189530989.

It can be written as a sum of positive squares in 4 ways, for example, as 169130025 + 819905956 = 13005^2 + 28634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 989035981 - 2²³ = 980647373 is a prime.

It is a super-2 number, since 2×989035981² = 1956384343425264722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989035987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52536 + ... + 68833.

It is an arithmetic number, because the mean of its divisors is an integer number (128348775).

Almost surely, 2^989035981 is an apocalyptic number.

It is an amenable number.

989035981 is a deficient number, since it is larger than the sum of its proper divisors (37754219).

989035981 is a wasteful number, since it uses less digits than its factorization.

989035981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121679.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 989035981 is about 31448.9424464480. The cubic root of 989035981 is about 996.3318884089.

The spelling of 989035981 in words is "nine hundred eighty-nine million, thirty-five thousand, nine hundred eighty-one".