2056180081 has 4 divisors (see below), whose sum is σ = 2058985972. Its totient is φ = 2053374192.

The previous prime is 2056180079. The next prime is 2056180099. The reversal of 2056180081 is 1800816502.

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 1696698481 + 359481600 = 41191^2 + 18960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2056180081 - 2¹ = 2056180079 is a prime.

It is a super-2 number, since 2×2056180081² = 8455753051002333122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2056180001) 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, 1401846 + ... + 1403311.

It is an arithmetic number, because the mean of its divisors is an integer number (514746493).

Almost surely, 2^2056180081 is an apocalyptic number.

It is an amenable number.

2056180081 is a deficient number, since it is larger than the sum of its proper divisors (2805891).

2056180081 is an equidigital number, since it uses as much as digits as its factorization.

2056180081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805890.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 2056180081 is about 45345.1219096387. The cubic root of 2056180081 is about 1271.6093597008.

Adding to 2056180081 its reverse (1800816502), we get a palindrome (3856996583).

The spelling of 2056180081 in words is "two billion, fifty-six million, one hundred eighty thousand, eighty-one".