1212155 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 815712.

The previous prime is 1212149. The next prime is 1212173. The reversal of 1212155 is 5512121.

1212155 = T₁₅₀ + T₁₅₁ + ... + T₂₁₉.

It is a cyclic number.

It is not a de Polignac number, because 1212155 - 2¹⁴ = 1195771 is a prime.

It is a plaindrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1772 + ... + 2358.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^1212155 is an apocalyptic number.

1212155 is a deficient number, since it is larger than the sum of its proper divisors (481285).

1212155 is an equidigital number, since it uses as much as digits as its factorization.

1212155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its digits is 100, while the sum is 17.

The square root of 1212155 is about 1100.9791097019. The cubic root of 1212155 is about 106.6234471173.

Adding to 1212155 its reverse (5512121), we get a palindrome (6724276).

It can be divided in two parts, 12 and 12155, that added together give a cube (12167 = 23³).

The spelling of 1212155 in words is "one million, two hundred twelve thousand, one hundred fifty-five".