1031223220 has 12 divisors (see below), whose sum is σ = 2165568804. Its totient is φ = 412489280.

The previous prime is 1031223217. The next prime is 1031223227. The reversal of 1031223220 is 223221301.

It can be written as a sum of positive squares in 2 ways, for example, as 708517924 + 322705296 = 26618^2 + 17964^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1031223194 and 1031223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031223227) 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, 25780561 + ... + 25780600.

It is an arithmetic number, because the mean of its divisors is an integer number (180464067).

Almost surely, 2^1031223220 is an apocalyptic number.

1031223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031223220 is an abundant number, since it is smaller than the sum of its proper divisors (1134345584).

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

1031223220 is a wasteful number, since it uses less digits than its factorization.

1031223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51561170 (or 51561168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1031223220 is about 32112.6644799213. The cubic root of 1031223220 is about 1010.3012596732.

Adding to 1031223220 its reverse (223221301), we get a palindrome (1254444521).

The spelling of 1031223220 in words is "one billion, thirty-one million, two hundred twenty-three thousand, two hundred twenty".