3121111240 has 32 divisors (see below), whose sum is σ = 7562693880. Its totient is φ = 1152410112.

The previous prime is 3121111237. The next prime is 3121111271. The reversal of 3121111240 is 421111213.

It can be written as a sum of positive squares in 4 ways, for example, as 1969051876 + 1152059364 = 44374^2 + 33942^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3000549 + ... + 3001588.

Almost surely, 2^3121111240 is an apocalyptic number.

It is an amenable number.

3121111240 is an abundant number, since it is smaller than the sum of its proper divisors (4441582640).

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

3121111240 is a wasteful number, since it uses less digits than its factorization.

3121111240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002161 (or 6002157 counting only the distinct ones).

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

The square root of 3121111240 is about 55866.9064831766. The cubic root of 3121111240 is about 1461.4021745409.

Adding to 3121111240 its reverse (421111213), we get a palindrome (3542222453).

The spelling of 3121111240 in words is "three billion, one hundred twenty-one million, one hundred eleven thousand, two hundred forty".