56521847 has 2 divisors, whose sum is σ = 56521848. Its totient is φ = 56521846.

The previous prime is 56521837. The next prime is 56521849. The reversal of 56521847 is 74812565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56521847 - 2⁴ = 56521831 is a prime.

Together with 56521849, it forms a pair of twin primes.

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 56521847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56521849) 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, 28260923 + 28260924.

It is an arithmetic number, because the mean of its divisors is an integer number (28260924).

Almost surely, 2^56521847 is an apocalyptic number.

56521847 is a deficient number, since it is larger than the sum of its proper divisors (1).

56521847 is an equidigital number, since it uses as much as digits as its factorization.

56521847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The square root of 56521847 is about 7518.1012895544. The cubic root of 56521847 is about 383.7709657613.

The spelling of 56521847 in words is "fifty-six million, five hundred twenty-one thousand, eight hundred forty-seven".