1217149 has 4 divisors (see below), whose sum is σ = 1288764. Its totient is φ = 1145536.

The previous prime is 1217147. The next prime is 1217171. The reversal of 1217149 is 9417121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9417121 = 7 ⋅1345303.

It can be written as a sum of positive squares in 2 ways, for example, as 1071225 + 145924 = 1035^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217149 - 2¹ = 1217147 is a prime.

It is a Duffinian number.

1217149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217141) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35782 + ... + 35815.

It is an arithmetic number, because the mean of its divisors is an integer number (322191).

2^1217149 is an apocalyptic number.

It is an amenable number.

1217149 is a deficient number, since it is larger than the sum of its proper divisors (71615).

1217149 is an equidigital number, since it uses as much as digits as its factorization.

1217149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71614.

The product of its digits is 504, while the sum is 25.

The square root of 1217149 is about 1103.2447597881. The cubic root of 1217149 is about 106.7696737155.

It can be divided in two parts, 12 and 17149, that added together give a square (17161 = 131²).

The spelling of 1217149 in words is "one million, two hundred seventeen thousand, one hundred forty-nine".