99434900889 has 81 divisors (see below), whose sum is σ = 159128940477. Its totient is φ = 62118078336.

The previous prime is 99434900881. The next prime is 99434900891. The reversal of 99434900889 is 98800943499.

The square root of 99434900889 is 315333.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 52732233225 + 46702667664 = 229635^2 + 216108^2 .

It is a tau number, because it is divible by the number of its divisors (81).

It is not a de Polignac number, because 99434900889 - 2³ = 99434900881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99434900881) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 434213427 + ... + 434213655.

Almost surely, 2^99434900889 is an apocalyptic number.

99434900889 is the 315333-rd square number.

99434900889 is the 157667-th centered octagonal number.

It is an amenable number.

99434900889 is a deficient number, since it is larger than the sum of its proper divisors (59694039588).

99434900889 is an frugal number, since it uses more digits than its factorization.

99434900889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 63.

The spelling of 99434900889 in words is "ninety-nine billion, four hundred thirty-four million, nine hundred thousand, eight hundred eighty-nine".