1998101911 has 8 divisors (see below), whose sum is σ = 2177728560. Its totient is φ = 1822179072.

The previous prime is 1998101899. The next prime is 1998101927. The reversal of 1998101911 is 1191018991.

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

It is a cyclic number.

It is not a de Polignac number, because 1998101911 - 2²⁵ = 1964547479 is a prime.

It is a super-2 number, since 2×1998101911² = 7984822493483703842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998101981) 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, 924826 + ... + 926983.

It is an arithmetic number, because the mean of its divisors is an integer number (272216070).

Almost surely, 2^1998101911 is an apocalyptic number.

1998101911 is a deficient number, since it is larger than the sum of its proper divisors (179626649).

1998101911 is a wasteful number, since it uses less digits than its factorization.

1998101911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851905.

The product of its (nonzero) digits is 5832, while the sum is 40.

The square root of 1998101911 is about 44700.1332324636. The cubic root of 1998101911 is about 1259.5223500260.

The spelling of 1998101911 in words is "one billion, nine hundred ninety-eight million, one hundred one thousand, nine hundred eleven".