6521490271 has 4 divisors (see below), whose sum is σ = 6536211912. Its totient is φ = 6506768632.

The previous prime is 6521490253. The next prime is 6521490301. The reversal of 6521490271 is 1720941256.

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

It is a cyclic number.

It is not a de Polignac number, because 6521490271 - 2²¹ = 6519393119 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 6521490271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521490671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7360156 + ... + 7361041.

It is an arithmetic number, because the mean of its divisors is an integer number (1634052978).

Almost surely, 2^6521490271 is an apocalyptic number.

6521490271 is a deficient number, since it is larger than the sum of its proper divisors (14721641).

6521490271 is a wasteful number, since it uses less digits than its factorization.

6521490271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14721640.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 6521490271 is about 80755.7445077438. The cubic root of 6521490271 is about 1868.3100511955.

The spelling of 6521490271 in words is "six billion, five hundred twenty-one million, four hundred ninety thousand, two hundred seventy-one".