1211355 has 24 divisors (see below), whose sum is σ = 2179632. Its totient is φ = 645408.

The previous prime is 1211339. The next prime is 1211381. The reversal of 1211355 is 5531121.

It is not a de Polignac number, because 1211355 - 2⁴ = 1211339 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 717 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (90818).

2^1211355 is an apocalyptic number.

1211355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211355 is a deficient number, since it is larger than the sum of its proper divisors (968277).

1211355 is an frugal number, since it uses more digits than its factorization.

1211355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 1005 counting only the distinct ones).

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

The square root of 1211355 is about 1100.6157367583. The cubic root of 1211355 is about 106.5999854506.

Adding to 1211355 its reverse (5531121), we get a palindrome (6742476).

The spelling of 1211355 in words is "one million, two hundred eleven thousand, three hundred fifty-five".