2056621549 has 4 divisors (see below), whose sum is σ = 2056802364. Its totient is φ = 2056440736.

The previous prime is 2056621513. The next prime is 2056621591. The reversal of 2056621549 is 9451266502.

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 1147176900 + 909444649 = 33870^2 + 30157^2 .

It is a cyclic number.

It is not a de Polignac number, because 2056621549 - 2¹⁹ = 2056097261 is a prime.

It is a super-2 number, since 2×2056621549² = 8459384391622318802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056621249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72112 + ... + 96505.

It is an arithmetic number, because the mean of its divisors is an integer number (514200591).

Almost surely, 2^2056621549 is an apocalyptic number.

It is an amenable number.

2056621549 is a deficient number, since it is larger than the sum of its proper divisors (180815).

2056621549 is a wasteful number, since it uses less digits than its factorization.

2056621549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180814.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 2056621549 is about 45349.9895148830. The cubic root of 2056621549 is about 1271.7003592967.

The spelling of 2056621549 in words is "two billion, fifty-six million, six hundred twenty-one thousand, five hundred forty-nine".