2056621547 has 4 divisors (see below), whose sum is σ = 2060275080. Its totient is φ = 2052968016.

The previous prime is 2056621513. The next prime is 2056621591. The reversal of 2056621547 is 7451266502.

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

It is a cyclic number.

It is not a de Polignac number, because 2056621547 - 2¹⁰ = 2056620523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2056621547.

It is not an unprimeable number, because it can be changed into a prime (2056621447) 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, 1825922 + ... + 1827047.

It is an arithmetic number, because the mean of its divisors is an integer number (515068770).

Almost surely, 2^2056621547 is an apocalyptic number.

2056621547 is a deficient number, since it is larger than the sum of its proper divisors (3653533).

2056621547 is an equidigital number, since it uses as much as digits as its factorization.

2056621547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653532.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 2056621547 is about 45349.9894928323. The cubic root of 2056621547 is about 1271.7003588845.

The spelling of 2056621547 in words is "two billion, fifty-six million, six hundred twenty-one thousand, five hundred forty-seven".