1981055449 has 8 divisors (see below), whose sum is σ = 2018700000. Its totient is φ = 1943546592.

The previous prime is 1981055437. The next prime is 1981055467. The reversal of 1981055449 is 9445501891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981055449 - 2¹⁷ = 1980924377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1981055399 and 1981055408.

It is not an unprimeable number, because it can be changed into a prime (1981055749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4204 + ... + 63085.

It is an arithmetic number, because the mean of its divisors is an integer number (252337500).

Almost surely, 2^1981055449 is an apocalyptic number.

It is an amenable number.

1981055449 is a deficient number, since it is larger than the sum of its proper divisors (37644551).

1981055449 is an equidigital number, since it uses as much as digits as its factorization.

1981055449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67847.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1981055449 is about 44509.0490687006. The cubic root of 1981055449 is about 1255.9303163718.

The spelling of 1981055449 in words is "one billion, nine hundred eighty-one million, fifty-five thousand, four hundred forty-nine".