1231143020 has 12 divisors (see below), whose sum is σ = 2585400384. Its totient is φ = 492457200.

The previous prime is 1231142999. The next prime is 1231143041. The reversal of 1231143020 is 203411321.

It is an interprime number because it is at equal distance from previous prime (1231142999) and next prime (1231143041).

It is a self number, because there is not a number n which added to its sum of digits gives 1231143020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30778556 + ... + 30778595.

It is an arithmetic number, because the mean of its divisors is an integer number (215450032).

Almost surely, 2^1231143020 is an apocalyptic number.

1231143020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231143020 is an abundant number, since it is smaller than the sum of its proper divisors (1354257364).

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

1231143020 is a wasteful number, since it uses less digits than its factorization.

1231143020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61557160 (or 61557158 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231143020 is about 35087.6476840497. The cubic root of 1231143020 is about 1071.7730582104.

Adding to 1231143020 its reverse (203411321), we get a palindrome (1434554341).

The spelling of 1231143020 in words is "one billion, two hundred thirty-one million, one hundred forty-three thousand, twenty".