1131031220 has 24 divisors (see below), whose sum is σ = 2591090208. Its totient is φ = 411284000.

The previous prime is 1131031219. The next prime is 1131031241. The reversal of 1131031220 is 221301311.

It is a super-2 number, since 2×1131031220² = 2558463241229376800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131031195 and 1131031204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2570306 + ... + 2570745.

It is an arithmetic number, because the mean of its divisors is an integer number (107962092).

Almost surely, 2^1131031220 is an apocalyptic number.

1131031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131031220 is an abundant number, since it is smaller than the sum of its proper divisors (1460058988).

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

1131031220 is a wasteful number, since it uses less digits than its factorization.

1131031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141071 (or 5141069 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1131031220 is about 33630.8076025539. The cubic root of 1131031220 is about 1041.8971842119.

Adding to 1131031220 its reverse (221301311), we get a palindrome (1352332531).

The spelling of 1131031220 in words is "one billion, one hundred thirty-one million, thirty-one thousand, two hundred twenty".