3551 has 4 divisors (see below), whose sum is σ = 3672. Its totient is φ = 3432.

The previous prime is 3547. The next prime is 3557. The reversal of 3551 is 1553.

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.

It is a cyclic number.

It is not a de Polignac number, because 3551 - 2² = 3547 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3551.

It is not an unprimeable number, because it can be changed into a prime (3557) 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, 20 + ... + 86.

It is an arithmetic number, because the mean of its divisors is an integer number (918).

2³⁵⁵¹ is an apocalyptic number.

3551 is a deficient number, since it is larger than the sum of its proper divisors (121).

3551 is an equidigital number, since it uses as much as digits as its factorization.

3551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120.

The product of its digits is 75, while the sum is 14.

The square root of 3551 is about 59.5902676618. The cubic root of 3551 is about 15.2563352698.

It can be divided in two parts, 3 and 551, that multiplied together give a triangular number (1653 = T₅₇).

The spelling of 3551 in words is "three thousand, five hundred fifty-one".