698489509 has 2 divisors, whose sum is σ = 698489510. Its totient is φ = 698489508.

The previous prime is 698489471. The next prime is 698489521. The reversal of 698489509 is 905984896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668481025 + 30008484 = 25855^2 + 5478^2 .

It is a cyclic number.

It is not a de Polignac number, because 698489509 - 2¹³ = 698481317 is a prime.

It is a super-2 number, since 2×698489509² = 975775188366122162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698489579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349244754 + 349244755.

It is an arithmetic number, because the mean of its divisors is an integer number (349244755).

Almost surely, 2^698489509 is an apocalyptic number.

It is an amenable number.

698489509 is a deficient number, since it is larger than the sum of its proper divisors (1).

698489509 is an equidigital number, since it uses as much as digits as its factorization.

698489509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The square root of 698489509 is about 26428.9520980307. The cubic root of 698489509 is about 887.2648889612.

The spelling of 698489509 in words is "six hundred ninety-eight million, four hundred eighty-nine thousand, five hundred nine".