998461999 has 4 divisors (see below), whose sum is σ = 998741664. Its totient is φ = 998182336.

The previous prime is 998461979. The next prime is 998462009. The reversal of 998461999 is 999164899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999164899 = 43 ⋅23236393.

It is a cyclic number.

It is not a de Polignac number, because 998461999 - 2²³ = 990073391 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 998461999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998461949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134407 + ... + 141640.

It is an arithmetic number, because the mean of its divisors is an integer number (249685416).

Almost surely, 2^998461999 is an apocalyptic number.

998461999 is a deficient number, since it is larger than the sum of its proper divisors (279665).

998461999 is a wasteful number, since it uses less digits than its factorization.

998461999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279664.

The product of its digits is 11337408, while the sum is 64.

The square root of 998461999 is about 31598.4493132179. The cubic root of 998461999 is about 999.4870699477.

The spelling of 998461999 in words is "nine hundred ninety-eight million, four hundred sixty-one thousand, nine hundred ninety-nine".