3837122521 has 4 divisors (see below), whose sum is σ = 3853591092. Its totient is φ = 3820653952.

The previous prime is 3837122519. The next prime is 3837122537. The reversal of 3837122521 is 1252217383.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1249976025 + 2587146496 = 35355^2 + 50864^2 .

It is a cyclic number.

It is not a de Polignac number, because 3837122521 - 2¹ = 3837122519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3837122221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8233936 + ... + 8234401.

It is an arithmetic number, because the mean of its divisors is an integer number (963397773).

Almost surely, 2^3837122521 is an apocalyptic number.

It is an amenable number.

3837122521 is a deficient number, since it is larger than the sum of its proper divisors (16468571).

3837122521 is a wasteful number, since it uses less digits than its factorization.

3837122521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16468570.

The product of its digits is 20160, while the sum is 34.

The square root of 3837122521 is about 61944.5116293607. The cubic root of 3837122521 is about 1565.5558146492. Note that the first 3 decimals are identical.

The spelling of 3837122521 in words is "three billion, eight hundred thirty-seven million, one hundred twenty-two thousand, five hundred twenty-one".