691583 has 2 divisors, whose sum is σ = 691584. Its totient is φ = 691582.

The previous prime is 691573. The next prime is 691589. The reversal of 691583 is 385196.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691583 is a prime.

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 691583.

It is not a weakly prime, because it can be changed into another prime (691589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345791 + 345792.

It is an arithmetic number, because the mean of its divisors is an integer number (345792).

2⁶⁹¹⁵⁸³ is an apocalyptic number.

691583 is a deficient number, since it is larger than the sum of its proper divisors (1).

691583 is an equidigital number, since it uses as much as digits as its factorization.

691583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 691583 is about 831.6146944349. The cubic root of 691583 is about 88.4330837860.

The spelling of 691583 in words is "six hundred ninety-one thousand, five hundred eighty-three".