219840101 has 6 divisors (see below), whose sum is σ = 238051890. Its totient is φ = 202929168.

The previous prime is 219840091. The next prime is 219840143. The reversal of 219840101 is 101048912.

It can be written as a sum of positive squares in 3 ways, for example, as 11730625 + 208109476 = 3425^2 + 14426^2 .

It is not a de Polignac number, because 219840101 - 2¹⁸ = 219577957 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 (219840301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 650246 + ... + 650583.

It is an arithmetic number, because the mean of its divisors is an integer number (39675315).

Almost surely, 2^219840101 is an apocalyptic number.

It is an amenable number.

219840101 is a deficient number, since it is larger than the sum of its proper divisors (18211789).

219840101 is a wasteful number, since it uses less digits than its factorization.

219840101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300855 (or 1300842 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 219840101 is about 14827.0058002282. The cubic root of 219840101 is about 603.5347836867.

The spelling of 219840101 in words is "two hundred nineteen million, eight hundred forty thousand, one hundred one".