3121540540 has 24 divisors (see below), whose sum is σ = 6562270512. Its totient is φ = 1247276160.

The previous prime is 3121540531. The next prime is 3121540559. The reversal of 3121540540 is 450451213.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64546 + ... + 102025.

It is an arithmetic number, because the mean of its divisors is an integer number (273427938).

Almost surely, 2^3121540540 is an apocalyptic number.

It is an amenable number.

3121540540 is an abundant number, since it is smaller than the sum of its proper divisors (3440729972).

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

3121540540 is a wasteful number, since it uses less digits than its factorization.

3121540540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167517 (or 167515 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 3121540540 is about 55870.7485183437. The cubic root of 3121540540 is about 1461.4691753773.

Adding to 3121540540 its reverse (450451213), we get a palindrome (3571991753).

The spelling of 3121540540 in words is "three billion, one hundred twenty-one million, five hundred forty thousand, five hundred forty".