698945509 has 8 divisors (see below), whose sum is σ = 702535680. Its totient is φ = 695365296.

The previous prime is 698945483. The next prime is 698945557. The reversal of 698945509 is 905549896.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 698945509 - 2⁵ = 698945477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 698945509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698945579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166059 + ... + 170215.

It is an arithmetic number, because the mean of its divisors is an integer number (87816960).

Almost surely, 2^698945509 is an apocalyptic number.

It is an amenable number.

698945509 is a deficient number, since it is larger than the sum of its proper divisors (3590171).

698945509 is a wasteful number, since it uses less digits than its factorization.

698945509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4979.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The square root of 698945509 is about 26437.5775932667. The cubic root of 698945509 is about 887.4579268291.

The spelling of 698945509 in words is "six hundred ninety-eight million, nine hundred forty-five thousand, five hundred nine".