1355 has 4 divisors (see below), whose sum is σ = 1632. Its totient is φ = 1080.

The previous prime is 1327. The next prime is 1361. The reversal of 1355 is 5531.

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

It is not a de Polignac number, because 1355 - 2⁶ = 1291 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131 + ... + 140.

It is an arithmetic number, because the mean of its divisors is an integer number (408).

1355 is a deficient number, since it is larger than the sum of its proper divisors (277).

1355 is an equidigital number, since it uses as much as digits as its factorization.

1355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

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

The square root of 1355 is about 36.8103246386. The cubic root of 1355 is about 11.0657222465.

Adding to 1355 its sum of digits (14), we get a square (1369 = 37²).

Adding to 1355 its reverse (5531), we get a palindrome (6886).

The spelling of 1355 in words is "one thousand, three hundred fifty-five".