681583 has 4 divisors (see below), whose sum is σ = 778960. Its totient is φ = 584208.

The previous prime is 681563. The next prime is 681589. The reversal of 681583 is 385186.

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 681583 - 2¹³ = 673391 is a prime.

681583 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681589) 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, 48678 + ... + 48691.

It is an arithmetic number, because the mean of its divisors is an integer number (194740).

2⁶⁸¹⁵⁸³ is an apocalyptic number.

681583 is a deficient number, since it is larger than the sum of its proper divisors (97377).

681583 is an equidigital number, since it uses as much as digits as its factorization.

681583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97376.

The product of its digits is 5760, while the sum is 31.

The square root of 681583 is about 825.5804018992. The cubic root of 681583 is about 88.0047776332.

The spelling of 681583 in words is "six hundred eighty-one thousand, five hundred eighty-three".