19981101 has 16 divisors (see below), whose sum is σ = 30568448. Its totient is φ = 11372400.

The previous prime is 19981079. The next prime is 19981109. The reversal of 19981101 is 10118991.

It is a happy number.

It is not a de Polignac number, because 19981101 - 2⁷ = 19980973 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19981109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3936 + ... + 7446.

It is an arithmetic number, because the mean of its divisors is an integer number (1910528).

Almost surely, 2^19981101 is an apocalyptic number.

It is an amenable number.

19981101 is a deficient number, since it is larger than the sum of its proper divisors (10587347).

19981101 is a wasteful number, since it uses less digits than its factorization.

19981101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 19981101 is about 4470.0224831649. The cubic root of 19981101 is about 271.3562350835.

The spelling of 19981101 in words is "nineteen million, nine hundred eighty-one thousand, one hundred one".