56359781 has 2 divisors, whose sum is σ = 56359782. Its totient is φ = 56359780.

The previous prime is 56359763. The next prime is 56359783. The reversal of 56359781 is 18795365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39062500 + 17297281 = 6250^2 + 4159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56359781 is a prime.

It is a super-2 number, since 2×56359781² = 6352849828735922, which contains 22 as substring.

Together with 56359783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56359783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28179890 + 28179891.

It is an arithmetic number, because the mean of its divisors is an integer number (28179891).

Almost surely, 2^56359781 is an apocalyptic number.

It is an amenable number.

56359781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56359781 is an equidigital number, since it uses as much as digits as its factorization.

56359781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 56359781 is about 7507.3151658899. The cubic root of 56359781 is about 383.4038170750.

The spelling of 56359781 in words is "fifty-six million, three hundred fifty-nine thousand, seven hundred eighty-one".