19801117 has 4 divisors (see below), whose sum is σ = 22629856. Its totient is φ = 16972380.

The previous prime is 19801081. The next prime is 19801123. The reversal of 19801117 is 71110891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71110891 = 103 ⋅690397.

It is a cyclic number.

It is not a de Polignac number, because 19801117 - 2²³ = 11412509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19801127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1414359 + ... + 1414372.

It is an arithmetic number, because the mean of its divisors is an integer number (5657464).

Almost surely, 2^19801117 is an apocalyptic number.

It is an amenable number.

19801117 is a deficient number, since it is larger than the sum of its proper divisors (2828739).

19801117 is an equidigital number, since it uses as much as digits as its factorization.

19801117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828738.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 19801117 is about 4449.8446040283. The cubic root of 19801117 is about 270.5390101169.

The spelling of 19801117 in words is "nineteen million, eight hundred one thousand, one hundred seventeen".