56749309 has 2 divisors, whose sum is σ = 56749310. Its totient is φ = 56749308.

The previous prime is 56749307. The next prime is 56749321. The reversal of 56749309 is 90394765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 16426809 = 6350^2 + 4053^2 .

It is a cyclic number.

It is not a de Polignac number, because 56749309 - 2¹ = 56749307 is a prime.

Together with 56749307, 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 (56749307) 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, 28374654 + 28374655.

It is an arithmetic number, because the mean of its divisors is an integer number (28374655).

Almost surely, 2^56749309 is an apocalyptic number.

It is an amenable number.

56749309 is a deficient number, since it is larger than the sum of its proper divisors (1).

56749309 is an equidigital number, since it uses as much as digits as its factorization.

56749309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 56749309 is about 7533.2137232392. The cubic root of 56749309 is about 384.2850824460.

The spelling of 56749309 in words is "fifty-six million, seven hundred forty-nine thousand, three hundred nine".