99090909899 has 2 divisors, whose sum is σ = 99090909900. Its totient is φ = 99090909898.

The previous prime is 99090909887. The next prime is 99090909989. The reversal of 99090909899 is 99890909099.

Together with next prime (99090909989) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (99890909099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99090909899 - 2¹² = 99090905803 is a prime.

It is a super-2 number, since 2×99090909899² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99090909839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49545454949 + 49545454950.

It is an arithmetic number, because the mean of its divisors is an integer number (49545454950).

Almost surely, 2^99090909899 is an apocalyptic number.

99090909899 is a deficient number, since it is larger than the sum of its proper divisors (1).

99090909899 is an equidigital number, since it uses as much as digits as its factorization.

99090909899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The spelling of 99090909899 in words is "ninety-nine billion, ninety million, nine hundred nine thousand, eight hundred ninety-nine".