56385181 has 2 divisors, whose sum is σ = 56385182. Its totient is φ = 56385180.

The previous prime is 56385139. The next prime is 56385191. The reversal of 56385181 is 18158365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56385081 + 100 = 7509^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 56385181 - 2⁷ = 56385053 is a prime.

It is a super-2 number, since 2×56385181² = 6358577272805522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56385181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56385191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28192590 + 28192591.

It is an arithmetic number, because the mean of its divisors is an integer number (28192591).

Almost surely, 2^56385181 is an apocalyptic number.

It is an amenable number.

56385181 is a deficient number, since it is larger than the sum of its proper divisors (1).

56385181 is an equidigital number, since it uses as much as digits as its factorization.

56385181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 37.

The square root of 56385181 is about 7509.0066586733. The cubic root of 56385181 is about 383.4614053894.

The spelling of 56385181 in words is "fifty-six million, three hundred eighty-five thousand, one hundred eighty-one".