1211158 has 16 divisors (see below), whose sum is σ = 2010960. Its totient is φ = 543456.

The previous prime is 1211141. The next prime is 1211167. The reversal of 1211158 is 8511121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (125685).

2^1211158 is an apocalyptic number.

1211158 is a deficient number, since it is larger than the sum of its proper divisors (799802).

1211158 is a wasteful number, since it uses less digits than its factorization.

1211158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311.

The product of its digits is 80, while the sum is 19.

The square root of 1211158 is about 1100.5262377608. The cubic root of 1211158 is about 106.5942064302.

Adding to 1211158 its reverse (8511121), we get a palindrome (9722279).

It can be divided in two parts, 1211 and 158, that added together give a square (1369 = 37²).

The spelling of 1211158 in words is "one million, two hundred eleven thousand, one hundred fifty-eight".