2081554749 has 12 divisors (see below), whose sum is σ = 3183554556. Its totient is φ = 1306073472.

The previous prime is 2081554733. The next prime is 2081554757. The reversal of 2081554749 is 9474551802.

2081554749 is a `hidden beast` number, since 20 + 8 + 1 + 554 + 74 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 724148100 + 1357406649 = 26910^2 + 36843^2 .

It is not a de Polignac number, because 2081554749 - 2⁴ = 2081554733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081554649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6802314 + ... + 6802619.

It is an arithmetic number, because the mean of its divisors is an integer number (265296213).

Almost surely, 2^2081554749 is an apocalyptic number.

It is an amenable number.

2081554749 is a deficient number, since it is larger than the sum of its proper divisors (1101999807).

2081554749 is a wasteful number, since it uses less digits than its factorization.

2081554749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13604956 (or 13604953 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 2081554749 is about 45624.0588834444. The cubic root of 2081554749 is about 1276.8188315910.

The spelling of 2081554749 in words is "two billion, eighty-one million, five hundred fifty-four thousand, seven hundred forty-nine".