697561 has 8 divisors (see below), whose sum is σ = 759240. Its totient is φ = 638208.

The previous prime is 697553. The next prime is 697579. The reversal of 697561 is 165796.

697561 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 126025 + 571536 = 355^2 + 756^2 .

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 697561 - 2³ = 697553 is a prime.

697561 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (697511) 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, 75 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (94905).

2⁶⁹⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

697561 is a deficient number, since it is larger than the sum of its proper divisors (61679).

697561 is a wasteful number, since it uses less digits than its factorization.

697561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163.

The product of its digits is 11340, while the sum is 34.

The square root of 697561 is about 835.2011733708. The cubic root of 697561 is about 88.6871564634.

The spelling of 697561 in words is "six hundred ninety-seven thousand, five hundred sixty-one".