3121455440 has 20 divisors (see below), whose sum is σ = 7257384084. Its totient is φ = 1248582144.

The previous prime is 3121455439. The next prime is 3121455473. The reversal of 3121455440 is 445541213.

It can be written as a sum of positive squares in 2 ways, for example, as 2138507536 + 982947904 = 46244^2 + 31352^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19509017 + ... + 19509176.

Almost surely, 2^3121455440 is an apocalyptic number.

It is an amenable number.

3121455440 is an abundant number, since it is smaller than the sum of its proper divisors (4135928644).

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

3121455440 is a wasteful number, since it uses less digits than its factorization.

3121455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39018206 (or 39018200 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 3121455440 is about 55869.9869339523. The cubic root of 3121455440 is about 1461.4558943114.

Adding to 3121455440 its reverse (445541213), we get a palindrome (3566996653).

The spelling of 3121455440 in words is "three billion, one hundred twenty-one million, four hundred fifty-five thousand, four hundred forty".