219849392161 has 21 divisors (see below), whose sum is σ = 256678413649. Its totient is φ = 188304485124.

The previous prime is 219849392153. The next prime is 219849392171. The reversal of 219849392161 is 161293948912.

It is a happy number.

The square root of 219849392161 is 468881.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 219849392161 - 2³ = 219849392153 is a prime.

It is a super-2 number, since 2×219849392161² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (219849392171) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 160825500 + ... + 160826866.

Almost surely, 2^219849392161 is an apocalyptic number.

219849392161 is the 468881-st square number.

219849392161 is the 234441-st centered octagonal number.

It is an amenable number.

219849392161 is a deficient number, since it is larger than the sum of its proper divisors (36829021488).

219849392161 is an frugal number, since it uses more digits than its factorization.

219849392161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776 (or 1374 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 55.

The spelling of 219849392161 in words is "two hundred nineteen billion, eight hundred forty-nine million, three hundred ninety-two thousand, one hundred sixty-one".