2999998561 has 16 divisors (see below), whose sum is σ = 3476805120. Its totient is φ = 2535413760.

The previous prime is 2999998553. The next prime is 2999998621. The reversal of 2999998561 is 1658999992.

It is a cyclic number.

It is not a de Polignac number, because 2999998561 - 2³ = 2999998553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2999998511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222081 + ... + 235201.

It is an arithmetic number, because the mean of its divisors is an integer number (217300320).

Almost surely, 2^2999998561 is an apocalyptic number.

It is an amenable number.

2999998561 is a deficient number, since it is larger than the sum of its proper divisors (476806559).

2999998561 is a wasteful number, since it uses less digits than its factorization.

2999998561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13584.

The product of its digits is 28343520, while the sum is 67.

The square root of 2999998561 is about 54772.2426143024. The cubic root of 2999998561 is about 1442.2493397077.

The spelling of 2999998561 in words is "two billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred sixty-one".