1245221 has 4 divisors (see below), whose sum is σ = 1247532. Its totient is φ = 1242912.

The previous prime is 1245217. The next prime is 1245227. The reversal of 1245221 is 1225421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1225421 = 811 ⋅1511.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 57121 = 1090^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245221 - 2² = 1245217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245227) 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, 131 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (311883).

2^1245221 is an apocalyptic number.

It is an amenable number.

1245221 is a deficient number, since it is larger than the sum of its proper divisors (2311).

1245221 is an equidigital number, since it uses as much as digits as its factorization.

1245221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310.

The product of its digits is 160, while the sum is 17.

The square root of 1245221 is about 1115.8947082946. The cubic root of 1245221 is about 107.5842786002.

The spelling of 1245221 in words is "one million, two hundred forty-five thousand, two hundred twenty-one".