4561946581 has 2 divisors, whose sum is σ = 4561946582. Its totient is φ = 4561946580.

The previous prime is 4561946579. The next prime is 4561946593. The reversal of 4561946581 is 1856491654.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3731988100 + 829958481 = 61090^2 + 28809^2 .

It is a cyclic number.

It is not a de Polignac number, because 4561946581 - 2¹ = 4561946579 is a prime.

It is a super-2 number, since 2×4561946581² = 41622713215795179122, which contains 22 as substring.

Together with 4561946579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4561946551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2280973290 + 2280973291.

It is an arithmetic number, because the mean of its divisors is an integer number (2280973291).

Almost surely, 2^4561946581 is an apocalyptic number.

It is an amenable number.

4561946581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4561946581 is an equidigital number, since it uses as much as digits as its factorization.

4561946581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 49.

The square root of 4561946581 is about 67542.1837150680. The cubic root of 4561946581 is about 1658.5047964008.

The spelling of 4561946581 in words is "four billion, five hundred sixty-one million, nine hundred forty-six thousand, five hundred eighty-one".