2196681449 has 4 divisors (see below), whose sum is σ = 2197468500. Its totient is φ = 2195894400.

The previous prime is 2196681439. The next prime is 2196681457. The reversal of 2196681449 is 9441866912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1825425625 + 371255824 = 42725^2 + 19268^2 .

It is a cyclic number.

It is not a de Polignac number, because 2196681449 - 2⁴ = 2196681433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2196681397 and 2196681406.

It is not an unprimeable number, because it can be changed into a prime (2196681419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389324 + ... + 394925.

It is an arithmetic number, because the mean of its divisors is an integer number (549367125).

Almost surely, 2^2196681449 is an apocalyptic number.

It is an amenable number.

2196681449 is a deficient number, since it is larger than the sum of its proper divisors (787051).

2196681449 is an equidigital number, since it uses as much as digits as its factorization.

2196681449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787050.

The product of its digits is 746496, while the sum is 50.

The square root of 2196681449 is about 46868.7683751131. The cubic root of 2196681449 is about 1299.9371663911.

The spelling of 2196681449 in words is "two billion, one hundred ninety-six million, six hundred eighty-one thousand, four hundred forty-nine".