99090909098 has 4 divisors (see below), whose sum is σ = 148636363650. Its totient is φ = 49545454548.

The previous prime is 99090909077. The next prime is 99090909101. The reversal of 99090909098 is 89090909099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89090909099 = 14887 ⋅5984477.

It can be written as a sum of positive squares in only one way, i.e., 76450591009 + 22640318089 = 276497^2 + 150467^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99090909098.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24772727273 + ... + 24772727276.

Almost surely, 2^99090909098 is an apocalyptic number.

99090909098 is a deficient number, since it is larger than the sum of its proper divisors (49545454552).

99090909098 is a wasteful number, since it uses less digits than its factorization.

99090909098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49545454551.

The product of its (nonzero) digits is 4251528, while the sum is 62.

Subtracting from 99090909098 its reverse (89090909099), we obtain a palindrome (9999999999).

The spelling of 99090909098 in words is "ninety-nine billion, ninety million, nine hundred nine thousand, ninety-eight".