1228511 has 4 divisors (see below), whose sum is σ = 1261752. Its totient is φ = 1195272.

The previous prime is 1228501. The next prime is 1228519. The reversal of 1228511 is 1158221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16565 + ... + 16638.

It is an arithmetic number, because the mean of its divisors is an integer number (315438).

2^1228511 is an apocalyptic number.

1228511 is a deficient number, since it is larger than the sum of its proper divisors (33241).

1228511 is an equidigital number, since it uses as much as digits as its factorization.

1228511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33240.

The product of its digits is 160, while the sum is 20.

The square root of 1228511 is about 1108.3821543132. The cubic root of 1228511 is about 107.1008743876.

The spelling of 1228511 in words is "one million, two hundred twenty-eight thousand, five hundred eleven".