697631 has 4 divisors (see below), whose sum is σ = 761064. Its totient is φ = 634200.

The previous prime is 697603. The next prime is 697637. The reversal of 697631 is 136796.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 697631 - 2¹⁰ = 696607 is a prime.

It is a super-2 number, since 2×697631² = 973378024322, which contains 22 as substring.

It is a Duffinian 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 697631.

It is not an unprimeable number, because it can be changed into a prime (697637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31700 + ... + 31721.

It is an arithmetic number, because the mean of its divisors is an integer number (190266).

2⁶⁹⁷⁶³¹ is an apocalyptic number.

697631 is a deficient number, since it is larger than the sum of its proper divisors (63433).

697631 is a wasteful number, since it uses less digits than its factorization.

697631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63432.

The product of its digits is 6804, while the sum is 32.

The square root of 697631 is about 835.2430783910. The cubic root of 697631 is about 88.6901229391.

It can be divided in two parts, 6976 and 31, that added together give a palindrome (7007).

The spelling of 697631 in words is "six hundred ninety-seven thousand, six hundred thirty-one".