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1159 = 1961

1159 has 4 divisors (see below), whose sum is σ = 1240. Its totient is φ = 1080.

The previous prime is 1153. The next prime is 1163. The reversal of 1159 is 9511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1159 - 23 = 1151 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a nialpdrome in base 6 and base 11.

It is a congruent number.

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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12 + ... + 49.

It is an arithmetic number, because the mean of its divisors is an integer number (310).

1159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1159 is a deficient number, since it is larger than the sum of its proper divisors (81).

1159 is an equidigital number, since it uses as much as digits as its factorization.

1159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80.

The product of its digits is 45, while the sum is 16.

The square root of 1159 is about 34.0440890611. The cubic root of 1159 is about 10.5041555736.

It can be divided in two parts, 115 and 9, that multiplied together give a triangular number (1035 = T45).

The spelling of 1159 in words is "one thousand, one hundred fifty-nine".

Divisors: 1 19 61 1159