697731 has 8 divisors (see below), whose sum is σ = 985104. Its totient is φ = 437760.

The previous prime is 697729. The next prime is 697733. The reversal of 697731 is 137796.

It is an interprime number because it is at equal distance from previous prime (697729) and next prime (697733).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 697731 - 2¹ = 697729 is a prime.

It is a super-2 number, since 2×697731² = 973657096722, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 697692 and 697701.

It is not an unprimeable number, because it can be changed into a prime (697733) 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, 6790 + ... + 6891.

It is an arithmetic number, because the mean of its divisors is an integer number (123138).

2⁶⁹⁷⁷³¹ is an apocalyptic number.

697731 is a deficient number, since it is larger than the sum of its proper divisors (287373).

697731 is a wasteful number, since it uses less digits than its factorization.

697731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13701.

The product of its digits is 7938, while the sum is 33.

The square root of 697731 is about 835.3029390586. The cubic root of 697731 is about 88.6943604174.

The spelling of 697731 in words is "six hundred ninety-seven thousand, seven hundred thirty-one".