989898901 has 4 divisors (see below), whose sum is σ = 990107404. Its totient is φ = 989690400.

The previous prime is 989898887. The next prime is 989898929. The reversal of 989898901 is 109898989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109898989 = 757 ⋅145177.

It can be written as a sum of positive squares in 2 ways, for example, as 795296401 + 194602500 = 28201^2 + 13950^2 .

It is a cyclic number.

It is not a de Polignac number, because 989898901 - 2¹⁵ = 989866133 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989898901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989898941) 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, 96960 + ... + 106681.

It is an arithmetic number, because the mean of its divisors is an integer number (247526851).

Almost surely, 2^989898901 is an apocalyptic number.

It is an amenable number.

989898901 is a deficient number, since it is larger than the sum of its proper divisors (208503).

989898901 is a wasteful number, since it uses less digits than its factorization.

989898901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208502.

The product of its (nonzero) digits is 3359232, while the sum is 61.

The square root of 989898901 is about 31462.6588355148. The cubic root of 989898901 is about 996.6215660376.

The spelling of 989898901 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred one".