1556 has 6 divisors (see below), whose sum is σ = 2730.
Its totient is φ = 776.
The previous prime is 1553. The next prime is 1559. The reversal of 1556 is 6551.
1556 is nontrivially palindromic in base 13.
1556 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.
It is an interprime number because it is at equal distance from previous prime (1553) and next prime (1559).
It can be written as a sum of positive squares in only one way, i.e., 1156 + 400 = 34^2 + 20^2
It is a super-2 number, since 2×15562 = 4842272, which contains 22 as substring.
1556 is an undulating number in base 13.
It is a plaindrome in base 6 and base 10.
It is a nialpdrome in base 5 and base 12.
It is a zygodrome in base 5.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1553) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191 + ... + 198.
It is an arithmetic number, because the mean of its divisors is an integer number (455).
21556 is an apocalyptic number.
It is an amenable number.
1556 is a deficient number, since it is larger than the sum of its proper divisors (1174).
1556 is a wasteful number, since it uses less digits than its factorization.
1556 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 393 (or 391 counting only the distinct ones).
The product of its digits is 150, while the sum is 17.
The square root of 1556 is about 39.4461658466.
The cubic root of 1556 is about 11.5878588784.
It can be divided in two parts, 155 and 6, that added together give a palindrome (161).
The spelling of 1556 in words is "one thousand, five hundred fifty-six".