56778901 has 2 divisors, whose sum is σ = 56778902. Its totient is φ = 56778900.

The previous prime is 56778899. The next prime is 56778919. The reversal of 56778901 is 10987765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55726225 + 1052676 = 7465^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 56778901 - 2¹ = 56778899 is a prime.

Together with 56778899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56778101) 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, 28389450 + 28389451.

It is an arithmetic number, because the mean of its divisors is an integer number (28389451).

Almost surely, 2^56778901 is an apocalyptic number.

It is an amenable number.

56778901 is a deficient number, since it is larger than the sum of its proper divisors (1).

56778901 is an equidigital number, since it uses as much as digits as its factorization.

56778901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 56778901 is about 7535.1775692415. The cubic root of 56778901 is about 384.3518661557.

The spelling of 56778901 in words is "fifty-six million, seven hundred seventy-eight thousand, nine hundred one".