535491681 has 16 divisors (see below), whose sum is σ = 754016256. Its totient is φ = 337355216.

The previous prime is 535491661. The next prime is 535491703. The reversal of 535491681 is 186194535.

It is a cyclic number.

It is not a de Polignac number, because 535491681 - 2⁶ = 535491617 is a prime.

It is a super-2 number, since 2×535491681² = 573502680840411522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (535491631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41025 + ... + 52478.

It is an arithmetic number, because the mean of its divisors is an integer number (47126016).

Almost surely, 2^535491681 is an apocalyptic number.

It is an amenable number.

535491681 is a deficient number, since it is larger than the sum of its proper divisors (218524575).

535491681 is a wasteful number, since it uses less digits than its factorization.

535491681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93612.

The product of its digits is 129600, while the sum is 42.

The square root of 535491681 is about 23140.6931832216. The cubic root of 535491681 is about 812.0527525444.

The spelling of 535491681 in words is "five hundred thirty-five million, four hundred ninety-one thousand, six hundred eighty-one".