998561099 has 8 divisors (see below), whose sum is σ = 1022770320. Its totient is φ = 974625696.

The previous prime is 998561071. The next prime is 998561101. The reversal of 998561099 is 990165899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998561099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998561299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61064 + ... + 75669.

It is an arithmetic number, because the mean of its divisors is an integer number (127846290).

Almost surely, 2^998561099 is an apocalyptic number.

998561099 is a deficient number, since it is larger than the sum of its proper divisors (24209221).

998561099 is a wasteful number, since it uses less digits than its factorization.

998561099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136909.

The product of its (nonzero) digits is 1574640, while the sum is 56.

The square root of 998561099 is about 31600.0173892357. The cubic root of 998561099 is about 999.5201361008.

The spelling of 998561099 in words is "nine hundred ninety-eight million, five hundred sixty-one thousand, ninety-nine".