3557 has 2 divisors, whose sum is σ = 3558.
Its totient is φ = 3556.
The previous prime is 3547. The next prime is 3559. The reversal of 3557 is 7553.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 2401 + 1156 = 49^2 + 34^2
It is a cyclic number.
It is not a de Polignac number, because 3557 - 24 = 3541 is a prime.
Together with 3559, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (3559) by changing a digit.
It is an upside-down number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1778 + 1779.
It is an arithmetic number, because the mean of its divisors is an integer number (1779).
23557 is an apocalyptic number.
It is an amenable number.
3557 is a deficient number, since it is larger than the sum of its proper divisors (1).
3557 is an equidigital number, since it uses as much as digits as its factorization.
3557 is an evil number, because the sum of its binary digits is even.
The product of its digits is 525, while the sum is 20.
The square root of 3557 is about 59.6405902050.
The cubic root of 3557 is about 15.2649231327.
It can be divided in two parts, 355 and 7, that multiplied together give a triangular number (2485 = T70).
The spelling of 3557 in words is "three thousand, five hundred fifty-seven".