99992989 has 4 divisors (see below), whose sum is σ = 100334556. Its totient is φ = 99651424.

The previous prime is 99992947. The next prime is 99992993. The reversal of 99992989 is 98929999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98929999 = 7 ⋅14132857.

It can be written as a sum of positive squares in 2 ways, for example, as 67980025 + 32012964 = 8245^2 + 5658^2 .

It is a cyclic number.

It is not a de Polignac number, because 99992989 - 2¹⁹ = 99468701 is a prime.

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 99992989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99992939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170344 + ... + 170929.

It is an arithmetic number, because the mean of its divisors is an integer number (25083639).

Almost surely, 2^99992989 is an apocalyptic number.

It is an amenable number.

99992989 is a deficient number, since it is larger than the sum of its proper divisors (341567).

99992989 is a wasteful number, since it uses less digits than its factorization.

99992989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341566.

The product of its digits is 8503056, while the sum is 64.

The square root of 99992989 is about 9999.6494438555. The cubic root of 99992989 is about 464.1480357147.

The spelling of 99992989 in words is "ninety-nine million, nine hundred ninety-two thousand, nine hundred eighty-nine".