1147221 has 12 divisors (see below), whose sum is σ = 1698060. Its totient is φ = 745920.

The previous prime is 1147213. The next prime is 1147229. The reversal of 1147221 is 1227411.

It is an interprime number because it is at equal distance from previous prime (1147213) and next prime (1147229).

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 1028196 = 345^2 + 1014^2 .

It is not a de Polignac number, because 1147221 - 2³ = 1147213 is a prime.

It is a super-2 number, since 2×1147221² = 2632232045682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1147194 and 1147203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1147229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1186 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (141505).

2^1147221 is an apocalyptic number.

It is an amenable number.

1147221 is a deficient number, since it is larger than the sum of its proper divisors (550839).

1147221 is a wasteful number, since it uses less digits than its factorization.

1147221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156 (or 3153 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1147221 is about 1071.0840303169. The cubic root of 1147221 is about 104.6844950946.

The spelling of 1147221 in words is "one million, one hundred forty-seven thousand, two hundred twenty-one".