7061820581 has 4 divisors (see below), whose sum is σ = 7109215500. Its totient is φ = 7014425664.

The previous prime is 7061820559. The next prime is 7061820589. The reversal of 7061820581 is 1850281607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1850281607 = 37 ⋅50007611.

It can be written as a sum of positive squares in 2 ways, for example, as 592192225 + 6469628356 = 24335^2 + 80434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7061820581 is a prime.

It is a super-2 number, since 2×7061820581² = 99738619836470355122, 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 (7061820589) 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, 23697236 + ... + 23697533.

It is an arithmetic number, because the mean of its divisors is an integer number (1777303875).

Almost surely, 2^7061820581 is an apocalyptic number.

It is an amenable number.

7061820581 is a deficient number, since it is larger than the sum of its proper divisors (47394919).

7061820581 is a wasteful number, since it uses less digits than its factorization.

7061820581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47394918.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 7061820581 is about 84034.6391733790. The cubic root of 7061820581 is about 1918.5460437915.

The spelling of 7061820581 in words is "seven billion, sixty-one million, eight hundred twenty thousand, five hundred eighty-one".