4138931521 has 8 divisors (see below), whose sum is σ = 4185657504. Its totient is φ = 4092354720.

The previous prime is 4138931501. The next prime is 4138931543. The reversal of 4138931521 is 1251398314.

4138931521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4138931521 - 2⁹ = 4138931009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4138931501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18981 + ... + 92941.

It is an arithmetic number, because the mean of its divisors is an integer number (523207188).

Almost surely, 2^4138931521 is an apocalyptic number.

It is an amenable number.

4138931521 is a deficient number, since it is larger than the sum of its proper divisors (46725983).

4138931521 is a wasteful number, since it uses less digits than its factorization.

4138931521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74591.

The product of its digits is 25920, while the sum is 37.

The square root of 4138931521 is about 64334.5282177463. The cubic root of 4138931521 is about 1605.5706243782.

The spelling of 4138931521 in words is "four billion, one hundred thirty-eight million, nine hundred thirty-one thousand, five hundred twenty-one".