• 1156² = 1336336 is the smallest square that contains exactly four digits '3'.

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1156 has 9 divisors (see below), whose sum is σ = 2149. Its totient is φ = 544.

The previous prime is 1153. The next prime is 1163. The reversal of 1156 is 6511.

1156 = T₃₃ + T₃₄.

The square root of 1156 is 34.

It is a perfect power (a square), and thus also a powerful number.

1156 is nontrivially palindromic in base 3 and base 16.

It can be written as a sum of positive squares in only one way, i.e., 900 + 256 = 30^2 + 16^2 .

It is a Duffinian number.

1156 is an undulating number in base 16.

It is a plaindrome in base 10 and base 13.

It is a nialpdrome in base 11 and base 15.

It is not an unprimeable number, because it can be changed into a prime (1151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 60 + ... + 76.

1156 is the 34-th square number.

1156 is the 22-nd centered pentagonal number.

It is an amenable number.

1156 is a deficient number, since it is larger than the sum of its proper divisors (993).

1156 is a wasteful number, since it uses less digits than its factorization.

1156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38 (or 19 counting only the distinct ones).

The product of its digits is 30, while the sum is 13.

The cubic root of 1156 is about 10.4950846230.

Adding to 1156 its reverse (6511), we get a palindrome (7667).

It can be divided in two parts, 115 and 6, that added together give a palindrome (121).

The spelling of 1156 in words is "one thousand, one hundred fifty-six".