3121640536 has 32 divisors (see below), whose sum is σ = 6750612000. Its totient is φ = 1325569536.

The previous prime is 3121640507. The next prime is 3121640537. The reversal of 3121640536 is 6350461213.

It is a junction number, because it is equal to n+sod(n) for n = 3121640498 and 3121640507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121640537) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 249601 + ... + 261808.

It is an arithmetic number, because the mean of its divisors is an integer number (210956625).

Almost surely, 2^3121640536 is an apocalyptic number.

It is an amenable number.

3121640536 is an abundant number, since it is smaller than the sum of its proper divisors (3628971464).

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

3121640536 is a wasteful number, since it uses less digits than its factorization.

3121640536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511531 (or 511527 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 3121640536 is about 55871.6433980602. The cubic root of 3121640536 is about 1461.4847808675.

The spelling of 3121640536 in words is "three billion, one hundred twenty-one million, six hundred forty thousand, five hundred thirty-six".