718748509 has 2 divisors, whose sum is σ = 718748510. Its totient is φ = 718748508.

The previous prime is 718748489. The next prime is 718748531. The reversal of 718748509 is 905847817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664505284 + 54243225 = 25778^2 + 7365^2 .

It is a cyclic number.

It is not a de Polignac number, because 718748509 - 2⁵ = 718748477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718748579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359374254 + 359374255.

It is an arithmetic number, because the mean of its divisors is an integer number (359374255).

Almost surely, 2^718748509 is an apocalyptic number.

It is an amenable number.

718748509 is a deficient number, since it is larger than the sum of its proper divisors (1).

718748509 is an equidigital number, since it uses as much as digits as its factorization.

718748509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 718748509 is about 26809.4854296012. The cubic root of 718748509 is about 895.7613483536.

It can be divided in two parts, 7187 and 48509, that added together give a square (55696 = 236²).

The spelling of 718748509 in words is "seven hundred eighteen million, seven hundred forty-eight thousand, five hundred nine".