1213155 has 12 divisors (see below), whose sum is σ = 2102880. Its totient is φ = 646992.

The previous prime is 1213153. The next prime is 1213183. The reversal of 1213155 is 5513121.

It is not a de Polignac number, because 1213155 - 2¹ = 1213153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13435 + ... + 13524.

It is an arithmetic number, because the mean of its divisors is an integer number (175240).

2^1213155 is an apocalyptic number.

1213155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213155 is a deficient number, since it is larger than the sum of its proper divisors (889725).

1213155 is a wasteful number, since it uses less digits than its factorization.

1213155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26970 (or 26967 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 1213155 is about 1101.4331573001. The cubic root of 1213155 is about 106.6527596887.

Adding to 1213155 its reverse (5513121), we get a palindrome (6726276).

The spelling of 1213155 in words is "one million, two hundred thirteen thousand, one hundred fifty-five".