56381399 has 2 divisors, whose sum is σ = 56381400. Its totient is φ = 56381398.

The previous prime is 56381393. The next prime is 56381407. The reversal of 56381399 is 99318365.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56381399 - 2⁴ = 56381383 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56381393) 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 as a sum of consecutive naturals, namely, 28190699 + 28190700.

It is an arithmetic number, because the mean of its divisors is an integer number (28190700).

Almost surely, 2^56381399 is an apocalyptic number.

56381399 is a deficient number, since it is larger than the sum of its proper divisors (1).

56381399 is an equidigital number, since it uses as much as digits as its factorization.

56381399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 56381399 is about 7508.7548235377. The cubic root of 56381399 is about 383.4528317214.

The spelling of 56381399 in words is "fifty-six million, three hundred eighty-one thousand, three hundred ninety-nine".