697118409 has 27 divisors (see below), whose sum is σ = 1091977653. Its totient is φ = 428362272.

The previous prime is 697118407. The next prime is 697118413. The reversal of 697118409 is 904811796.

It is a happy number.

The square root of 697118409 is 26403.

It is a perfect power (a square), and thus also a powerful number.

697118409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 68112009 + 629006400 = 8253^2 + 25080^2 .

It is not a de Polignac number, because 697118409 - 2¹ = 697118407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (697118407) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1029379 + ... + 1030055.

Almost surely, 2^697118409 is an apocalyptic number.

697118409 is the 26403-rd square number.

697118409 is the 13202-nd centered octagonal number.

It is an amenable number.

697118409 is a deficient number, since it is larger than the sum of its proper divisors (394859244).

697118409 is an equidigital number, since it uses as much as digits as its factorization.

697118409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The cubic root of 697118409 is about 886.6839564690.

The spelling of 697118409 in words is "six hundred ninety-seven million, one hundred eighteen thousand, four hundred nine".