1231103540 has 24 divisors (see below), whose sum is σ = 2603922720. Its totient is φ = 488897568.

The previous prime is 1231103521. The next prime is 1231103551. The reversal of 1231103540 is 453011321.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 218642 + ... + 224201.

It is an arithmetic number, because the mean of its divisors is an integer number (108496780).

Almost surely, 2^1231103540 is an apocalyptic number.

1231103540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231103540 is an abundant number, since it is smaller than the sum of its proper divisors (1372819180).

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

1231103540 is a wasteful number, since it uses less digits than its factorization.

1231103540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442991 (or 442989 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1231103540 is about 35087.0850883911. The cubic root of 1231103540 is about 1071.7616016339.

Adding to 1231103540 its reverse (453011321), we get a palindrome (1684114861).

The spelling of 1231103540 in words is "one billion, two hundred thirty-one million, one hundred three thousand, five hundred forty".