1211145 has 16 divisors (see below), whose sum is σ = 2087232. Its totient is φ = 596160.

The previous prime is 1211141. The next prime is 1211167. The reversal of 1211145 is 5411121.

It is a happy number.

It is not a de Polignac number, because 1211145 - 2² = 1211141 is a prime.

It is a super-2 number, since 2×1211145² = 2933744422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

1211145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1211141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2911 + ... + 3300.

It is an arithmetic number, because the mean of its divisors is an integer number (130452).

2^1211145 is an apocalyptic number.

1211145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211145 is a deficient number, since it is larger than the sum of its proper divisors (876087).

1211145 is a wasteful number, since it uses less digits than its factorization.

1211145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232.

The product of its digits is 40, while the sum is 15.

The square root of 1211145 is about 1100.5203314796. The cubic root of 1211145 is about 106.5938250515.

Adding to 1211145 its reverse (5411121), we get a palindrome (6622266).

The spelling of 1211145 in words is "one million, two hundred eleven thousand, one hundred forty-five".