3123740521 has 16 divisors (see below), whose sum is σ = 3467117376. Its totient is φ = 2790360000.

The previous prime is 3123740491. The next prime is 3123740533. The reversal of 3123740521 is 1250473213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3123740521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3123740521.

It is not an unprimeable number, because it can be changed into a prime (3123740621) 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, 924966 + ... + 928336.

It is an arithmetic number, because the mean of its divisors is an integer number (216694836).

Almost surely, 2^3123740521 is an apocalyptic number.

It is an amenable number.

3123740521 is a deficient number, since it is larger than the sum of its proper divisors (343376855).

3123740521 is a wasteful number, since it uses less digits than its factorization.

3123740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 3123740521 is about 55890.4331795702. The cubic root of 3123740521 is about 1461.8124299703.

The spelling of 3123740521 in words is "three billion, one hundred twenty-three million, seven hundred forty thousand, five hundred twenty-one".