697 has 4 divisors (see below), whose sum is σ = 756. Its totient is φ = 640.

The previous prime is 691. The next prime is 701. The reversal of 697 is 796.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 256 + 441 = 16^2 + 21^2 .

It is a cyclic number.

It is not a de Polignac number, because 697 - 2⁷ = 569 is a prime.

It is a cake number, because a cake can be divided into 697 parts by 16 planar cuts.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4 + ... + 37.

It is an arithmetic number, because the mean of its divisors is an integer number (189).

It is a 12-hyperperfect number.

697 is the 17-th heptagonal number.

It is an amenable number.

697 is a deficient number, since it is larger than the sum of its proper divisors (59).

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

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

The sum of its prime factors is 58.

The product of its digits is 378, while the sum is 22.

The square root of 697 is about 26.4007575649. The cubic root of 697 is about 8.8663375108.

Subtracting 697 from its reverse (796), we obtain a palindrome (99).

The spelling of 697 in words is "six hundred ninety-seven", and thus it is an aban number and an oban number.