56381489 has 2 divisors, whose sum is σ = 56381490. Its totient is φ = 56381488.

The previous prime is 56381447. The next prime is 56381491. The reversal of 56381489 is 98418365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53875600 + 2505889 = 7340^2 + 1583^2 .

It is a cyclic number.

It is not a de Polignac number, because 56381489 - 2¹⁶ = 56315953 is a prime.

Together with 56381491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56381419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28190744 + 28190745.

It is an arithmetic number, because the mean of its divisors is an integer number (28190745).

Almost surely, 2^56381489 is an apocalyptic number.

It is an amenable number.

56381489 is a deficient number, since it is larger than the sum of its proper divisors (1).

56381489 is an equidigital number, since it uses as much as digits as its factorization.

56381489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The square root of 56381489 is about 7508.7608165396. The cubic root of 56381489 is about 383.4530357529.

The spelling of 56381489 in words is "fifty-six million, three hundred eighty-one thousand, four hundred eighty-nine".