1031131220 has 48 divisors (see below), whose sum is σ = 2499251328. Its totient is φ = 350025600.

The previous prime is 1031131183. The next prime is 1031131267. The reversal of 1031131220 is 221311301.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1031131195 and 1031131204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22322 + ... + 50601.

It is an arithmetic number, because the mean of its divisors is an integer number (52067736).

Almost surely, 2^1031131220 is an apocalyptic number.

1031131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031131220 is an abundant number, since it is smaller than the sum of its proper divisors (1468120108).

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

1031131220 is a wasteful number, since it uses less digits than its factorization.

1031131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73040 (or 73038 counting only the distinct ones).

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

The square root of 1031131220 is about 32111.2319913142. The cubic root of 1031131220 is about 1010.2712142933.

Adding to 1031131220 its reverse (221311301), we get a palindrome (1252442521).

The spelling of 1031131220 in words is "one billion, thirty-one million, one hundred thirty-one thousand, two hundred twenty".