56789898509 has 2 divisors, whose sum is σ = 56789898510. Its totient is φ = 56789898508.

The previous prime is 56789898481. The next prime is 56789898521. The reversal of 56789898509 is 90589898765.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53892229609 + 2897668900 = 232147^2 + 53830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56789898509 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56789898569) 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, 28394949254 + 28394949255.

It is an arithmetic number, because the mean of its divisors is an integer number (28394949255).

Almost surely, 2^56789898509 is an apocalyptic number.

It is an amenable number.

56789898509 is a deficient number, since it is larger than the sum of its proper divisors (1).

56789898509 is an equidigital number, since it uses as much as digits as its factorization.

56789898509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 391910400, while the sum is 74.

The spelling of 56789898509 in words is "fifty-six billion, seven hundred eighty-nine million, eight hundred ninety-eight thousand, five hundred nine".