3533681 has 4 divisors (see below), whose sum is σ = 3538164. Its totient is φ = 3529200.

The previous prime is 3533657. The next prime is 3533683. The reversal of 3533681 is 1863353.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1863353 = 17 ⋅109609.

It can be written as a sum of positive squares in 2 ways, for example, as 1343281 + 2190400 = 1159^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 3533681 - 2¹⁸ = 3271537 is a prime.

It is a super-2 number, since 2×3533681² = 24973802819522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3533683) 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, 710 + ... + 2751.

It is an arithmetic number, because the mean of its divisors is an integer number (884541).

Almost surely, 2^3533681 is an apocalyptic number.

It is an amenable number.

3533681 is a deficient number, since it is larger than the sum of its proper divisors (4483).

3533681 is a wasteful number, since it uses less digits than its factorization.

3533681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482.

The product of its digits is 6480, while the sum is 29.

The square root of 3533681 is about 1879.8087668697. The cubic root of 3533681 is about 152.3149201452.

The spelling of 3533681 in words is "three million, five hundred thirty-three thousand, six hundred eighty-one".