535681 has 4 divisors (see below), whose sum is σ = 537264. Its totient is φ = 534100.

The previous prime is 535679. The next prime is 535697. The reversal of 535681 is 186535.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186535 = 5 ⋅37307.

It is a cyclic number.

It is not a de Polignac number, because 535681 - 2¹ = 535679 is a prime.

It is a super-2 number, since 2×535681² = 573908267522, which contains 22 as substring.

It is a Duffinian number.

535681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (535181) 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, 55 + ... + 1036.

It is an arithmetic number, because the mean of its divisors is an integer number (134316).

2⁵³⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

535681 is a deficient number, since it is larger than the sum of its proper divisors (1583).

535681 is a wasteful number, since it uses less digits than its factorization.

535681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582.

The product of its digits is 3600, while the sum is 28.

The square root of 535681 is about 731.9023158865. The cubic root of 535681 is about 81.2148439621.

The spelling of 535681 in words is "five hundred thirty-five thousand, six hundred eighty-one".