3551021 has 4 divisors (see below), whose sum is σ = 3673500. Its totient is φ = 3428544.

The previous prime is 3551003. The next prime is 3551027. The reversal of 3551021 is 1201553.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 2758921 = 890^2 + 1661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3551021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3551027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61196 + ... + 61253.

It is an arithmetic number, because the mean of its divisors is an integer number (918375).

Almost surely, 2^3551021 is an apocalyptic number.

It is an amenable number.

3551021 is a deficient number, since it is larger than the sum of its proper divisors (122479).

3551021 is a wasteful number, since it uses less digits than its factorization.

3551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122478.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 3551021 is about 1884.4152939307. The cubic root of 3551021 is about 152.5636534417.

Adding to 3551021 its reverse (1201553), we get a palindrome (4752574).

The spelling of 3551021 in words is "three million, five hundred fifty-one thousand, twenty-one".