6503871481 has 4 divisors (see below), whose sum is σ = 6545297572. Its totient is φ = 6462445392.

The previous prime is 6503871463. The next prime is 6503871497. The reversal of 6503871481 is 1841783056.

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 2121431481 + 4382440000 = 46059^2 + 66200^2 .

It is a cyclic number.

It is not a de Polignac number, because 6503871481 - 2¹⁷ = 6503740409 is a prime.

It is a super-2 number, since 2×6503871481² = 84600688482730266722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6503871401) 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, 20712810 + ... + 20713123.

It is an arithmetic number, because the mean of its divisors is an integer number (1636324393).

Almost surely, 2^6503871481 is an apocalyptic number.

It is an amenable number.

6503871481 is a deficient number, since it is larger than the sum of its proper divisors (41426091).

6503871481 is a wasteful number, since it uses less digits than its factorization.

6503871481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41426090.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 6503871481 is about 80646.5838148151. The cubic root of 6503871481 is about 1866.6260265635.

The spelling of 6503871481 in words is "six billion, five hundred three million, eight hundred seventy-one thousand, four hundred eighty-one".