998883091 has 4 divisors (see below), whose sum is σ = 999009792. Its totient is φ = 998756392.

The previous prime is 998883089. The next prime is 998883097. The reversal of 998883091 is 190388899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190388899 = 17 ⋅11199347.

It is a cyclic number.

It is not a de Polignac number, because 998883091 - 2¹ = 998883089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998883097) 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, 50680 + ... + 67573.

It is an arithmetic number, because the mean of its divisors is an integer number (249752448).

Almost surely, 2^998883091 is an apocalyptic number.

998883091 is the 16894-th nonagonal number.

998883091 is a deficient number, since it is larger than the sum of its proper divisors (126701).

998883091 is a wasteful number, since it uses less digits than its factorization.

998883091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126700.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 998883091 is about 31605.1117859121. Note that the first 3 decimals coincide. The cubic root of 998883091 is about 999.6275583044.

The spelling of 998883091 in words is "nine hundred ninety-eight million, eight hundred eighty-three thousand, ninety-one".