1998582011 has 4 divisors (see below), whose sum is σ = 2001362400. Its totient is φ = 1995801624.

The previous prime is 1998581947. The next prime is 1998582017. The reversal of 1998582011 is 1102858991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998582011 - 2⁶ = 1998581947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998582017) 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, 1389116 + ... + 1390553.

It is an arithmetic number, because the mean of its divisors is an integer number (500340600).

Almost surely, 2^1998582011 is an apocalyptic number.

1998582011 is a deficient number, since it is larger than the sum of its proper divisors (2780389).

1998582011 is an equidigital number, since it uses as much as digits as its factorization.

1998582011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780388.

The product of its (nonzero) digits is 51840, while the sum is 44.

The square root of 1998582011 is about 44705.5031399939. The cubic root of 1998582011 is about 1259.6232204657.

The spelling of 1998582011 in words is "one billion, nine hundred ninety-eight million, five hundred eighty-two thousand, eleven".