1553 has 2 divisors, whose sum is σ = 1554.
Its totient is φ = 1552.
The previous prime is 1549. The next prime is 1559. The reversal of 1553 is 3551.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1024 + 529 = 32^2 + 23^2
It is a cyclic number.
It is not a de Polignac number, because 1553 - 22 = 1549 is a prime.
It is a Chen prime.
It is an Ulam number.
It is a plaindrome in base 14.
It is a nialpdrome in base 12 and base 16.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 1553.
It is not a weakly prime, because it can be changed into another prime (1559) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776 + 777.
It is an arithmetic number, because the mean of its divisors is an integer number (777).
It is an amenable number.
1553 is a deficient number, since it is larger than the sum of its proper divisors (1).
1553 is an equidigital number, since it uses as much as digits as its factorization.
1553 is an evil number, because the sum of its binary digits is even.
The product of its digits is 75, while the sum is 14.
The square root of 1553 is about 39.4081209905.
The cubic root of 1553 is about 11.5804068771.
It can be divided in two parts, 155 and 3, that multiplied together give a triangular number (465 = T30).
The spelling of 1553 in words is "one thousand, five hundred fifty-three".