3551321 has 4 divisors (see below), whose sum is σ = 3594192. Its totient is φ = 3508452.

The previous prime is 3551291. The next prime is 3551323. The reversal of 3551321 is 1231553.

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.

It is a cyclic number.

It is not a de Polignac number, because 3551321 - 2⁶ = 3551257 is a prime.

It is a super-2 number, since 2×3551321² = 25223761690082, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3551293 and 3551302.

It is not an unprimeable number, because it can be changed into a prime (3551323) 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, 21311 + ... + 21476.

It is an arithmetic number, because the mean of its divisors is an integer number (898548).

Almost surely, 2^3551321 is an apocalyptic number.

It is an amenable number.

3551321 is a deficient number, since it is larger than the sum of its proper divisors (42871).

3551321 is an equidigital number, since it uses as much as digits as its factorization.

3551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42870.

The product of its digits is 450, while the sum is 20.

The square root of 3551321 is about 1884.4948925375. The cubic root of 3551321 is about 152.5679496528.

Adding to 3551321 its reverse (1231553), we get a palindrome (4782874).

The spelling of 3551321 in words is "three million, five hundred fifty-one thousand, three hundred twenty-one".