697581 has 6 divisors (see below), whose sum is σ = 1007630. Its totient is φ = 465048.

The previous prime is 697579. The next prime is 697583. The reversal of 697581 is 185796.

It is an interprime number because it is at equal distance from previous prime (697579) and next prime (697583).

It can be written as a sum of positive squares in only one way, i.e., 695556 + 2025 = 834^2 + 45^2 .

It is not a de Polignac number, because 697581 - 2¹ = 697579 is a prime.

It is a super-2 number, since 2×697581² = 973238503122, 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 697581.

It is not an unprimeable number, because it can be changed into a prime (697583) 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 5 ways as a sum of consecutive naturals, for example, 38746 + ... + 38763.

2⁶⁹⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

697581 is a deficient number, since it is larger than the sum of its proper divisors (310049).

697581 is a wasteful number, since it uses less digits than its factorization.

697581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77515 (or 77512 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 697581 is about 835.2131464483. The cubic root of 697581 is about 88.6880040482.

It can be divided in two parts, 6975 and 81, that added together give a square (7056 = 84²).

The spelling of 697581 in words is "six hundred ninety-seven thousand, five hundred eighty-one".