1145221 has 16 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 877680.

The previous prime is 1145213. The next prime is 1145227. The reversal of 1145221 is 1225411.

It is a cyclic number.

It is not a de Polignac number, because 1145221 - 2³ = 1145213 is a prime.

It is a super-2 number, since 2×1145221² = 2623062277682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1145195 and 1145204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145227) 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, 8170 + ... + 8308.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1145221 is an apocalyptic number.

1145221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1145221 is a deficient number, since it is larger than the sum of its proper divisors (306299).

1145221 is a wasteful number, since it uses less digits than its factorization.

1145221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264.

The product of its digits is 80, while the sum is 16.

The square root of 1145221 is about 1070.1499894875. The cubic root of 1145221 is about 104.6236260393.

It can be divided in two parts, 114 and 5221, that added together give a palindrome (5335).

The spelling of 1145221 in words is "one million, one hundred forty-five thousand, two hundred twenty-one".