2194981513209 has 27 divisors (see below), whose sum is σ = 3180246349189. Its totient is φ = 1458849699960.

The previous prime is 2194981513187. The next prime is 2194981513223. The reversal of 2194981513209 is 9023151894912.

It is a happy number.

The square root of 2194981513209 is 1481547.

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

2194981513209 is a `hidden beast` number, since 2 + 1 + 9 + 49 + 81 + 513 + 2 + 0 + 9 = 666.

It is not a de Polignac number, because 2194981513209 - 2¹¹ = 2194981511161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2194981513259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2128982524 + ... + 2128983554.

Almost surely, 2^{2194981513209} is an apocalyptic number.

2194981513209 is the 1481547-th square number.

2194981513209 is the 740774-th centered octagonal number.

It is an amenable number.

2194981513209 is a deficient number, since it is larger than the sum of its proper divisors (985264835980).

2194981513209 is an frugal number, since it uses more digits than its factorization.

2194981513209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026 (or 1513 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 2194981513209 in words is "two trillion, one hundred ninety-four billion, nine hundred eighty-one million, five hundred thirteen thousand, two hundred nine".