3291021 has 6 divisors (see below), whose sum is σ = 4753710. Its totient is φ = 2194008.

The previous prime is 3291017. The next prime is 3291031. The reversal of 3291021 is 1201923.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2673225 + 617796 = 1635^2 + 786^2 .

It is not a de Polignac number, because 3291021 - 2² = 3291017 is a prime.

It is a super-3 number, since 3×3291021³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3290985 and 3291003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3291031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182826 + ... + 182843.

It is an arithmetic number, because the mean of its divisors is an integer number (792285).

Almost surely, 2^3291021 is an apocalyptic number.

It is an amenable number.

3291021 is a deficient number, since it is larger than the sum of its proper divisors (1462689).

3291021 is a wasteful number, since it uses less digits than its factorization.

3291021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365675 (or 365672 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 3291021 is about 1814.1171406500. The cubic root of 3291021 is about 148.7454024895.

Adding to 3291021 its reverse (1201923), we get a palindrome (4492944).

The spelling of 3291021 in words is "three million, two hundred ninety-one thousand, twenty-one".