1131220 has 24 divisors (see below), whose sum is σ = 2397024. Its totient is φ = 448416.

The previous prime is 1131217. The next prime is 1131223. The reversal of 1131220 is 221311.

It is an interprime number because it is at equal distance from previous prime (1131217) and next prime (1131223).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1131197 and 1131206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3087 + ... + 3433.

It is an arithmetic number, because the mean of its divisors is an integer number (99876).

2^1131220 is an apocalyptic number.

1131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131220 is an abundant number, since it is smaller than the sum of its proper divisors (1265804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131220 is a wasteful number, since it uses less digits than its factorization.

1131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1131220 is about 1063.5882662008. The cubic root of 1131220 is about 104.1955148544.

Adding to 1131220 its reverse (221311), we get a palindrome (1352531).

Subtracting from 1131220 its reverse (221311), we obtain a palindrome (909909).

The spelling of 1131220 in words is "one million, one hundred thirty-one thousand, two hundred twenty".