697509 has 12 divisors (see below), whose sum is σ = 1060800. Its totient is φ = 440424.

The previous prime is 697507. The next prime is 697511. The reversal of 697509 is 905796.

It is an interprime number because it is at equal distance from previous prime (697507) and next prime (697511).

It is not a de Polignac number, because 697509 - 2¹ = 697507 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

697509 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697509.

It is not an unprimeable number, because it can be changed into a prime (697507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1869 + ... + 2210.

It is an arithmetic number, because the mean of its divisors is an integer number (88400).

2⁶⁹⁷⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

697509 is a deficient number, since it is larger than the sum of its proper divisors (363291).

697509 is a wasteful number, since it uses less digits than its factorization.

697509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104 (or 4101 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 697509 is about 835.1700425662. The cubic root of 697509 is about 88.6849526673.

The spelling of 697509 in words is "six hundred ninety-seven thousand, five hundred nine".