1013231220 has 48 divisors (see below), whose sum is σ = 2843201088. Its totient is φ = 269608960.

The previous prime is 1013231209. The next prime is 1013231267. The reversal of 1013231220 is 221323101.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1013231220.

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, 9940 + ... + 46100.

It is an arithmetic number, because the mean of its divisors is an integer number (59233356).

Almost surely, 2^1013231220 is an apocalyptic number.

1013231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1013231220 is an abundant number, since it is smaller than the sum of its proper divisors (1829969868).

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

1013231220 is a wasteful number, since it uses less digits than its factorization.

1013231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36640 (or 36638 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1013231220 is about 31831.2930934324. The cubic root of 1013231220 is about 1004.3910967137.

Adding to 1013231220 its reverse (221323101), we get a palindrome (1234554321).

The spelling of 1013231220 in words is "one billion, thirteen million, two hundred thirty-one thousand, two hundred twenty".