1311121240 has 64 divisors (see below), whose sum is σ = 3465776160. Its totient is φ = 440094720.

The previous prime is 1311121153. The next prime is 1311121249. The reversal of 1311121240 is 421211131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311121249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108889 + ... + 120328.

Almost surely, 2^1311121240 is an apocalyptic number.

1311121240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311121240 is an abundant number, since it is smaller than the sum of its proper divisors (2154654920).

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

1311121240 is a wasteful number, since it uses less digits than its factorization.

1311121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229252 (or 229248 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1311121240 is about 36209.4081697009. The cubic root of 1311121240 is about 1094.4962661513.

Adding to 1311121240 its reverse (421211131), we get a palindrome (1732332371).

The spelling of 1311121240 in words is "one billion, three hundred eleven million, one hundred twenty-one thousand, two hundred forty".