56821403 has 2 divisors, whose sum is σ = 56821404. Its totient is φ = 56821402.

The previous prime is 56821379. The next prime is 56821409. The reversal of 56821403 is 30412865.

56821403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56821403 - 2⁸ = 56821147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56821409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28410701 + 28410702.

It is an arithmetic number, because the mean of its divisors is an integer number (28410702).

Almost surely, 2^56821403 is an apocalyptic number.

56821403 is a deficient number, since it is larger than the sum of its proper divisors (1).

56821403 is an equidigital number, since it uses as much as digits as its factorization.

56821403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 56821403 is about 7537.9972804453. The cubic root of 56821403 is about 384.4477447794.

The spelling of 56821403 in words is "fifty-six million, eight hundred twenty-one thousand, four hundred three".