56820899 has 2 divisors, whose sum is σ = 56820900. Its totient is φ = 56820898.

The previous prime is 56820871. The next prime is 56820917. The reversal of 56820899 is 99802865.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56820899 is a prime.

It is a super-2 number, since 2×56820899² = 6457229126336402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56820839) 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, 28410449 + 28410450.

It is an arithmetic number, because the mean of its divisors is an integer number (28410450).

Almost surely, 2^56820899 is an apocalyptic number.

56820899 is a deficient number, since it is larger than the sum of its proper divisors (1).

56820899 is an equidigital number, since it uses as much as digits as its factorization.

56820899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 56820899 is about 7537.9638497409. The cubic root of 56820899 is about 384.4466081054.

The spelling of 56820899 in words is "fifty-six million, eight hundred twenty thousand, eight hundred ninety-nine".