6501531641 has 4 divisors (see below), whose sum is σ = 7092579984. Its totient is φ = 5910483300.

The previous prime is 6501531551. The next prime is 6501531643. The reversal of 6501531641 is 1461351056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6501531641 - 2³⁰ = 5427789817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6501531598 and 6501531607.

It is not an unprimeable number, because it can be changed into a prime (6501531643) 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, 295524155 + ... + 295524176.

It is an arithmetic number, because the mean of its divisors is an integer number (1773144996).

Almost surely, 2^6501531641 is an apocalyptic number.

It is an amenable number.

6501531641 is a deficient number, since it is larger than the sum of its proper divisors (591048343).

6501531641 is a wasteful number, since it uses less digits than its factorization.

6501531641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591048342.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 6501531641 is about 80632.0757577281. The cubic root of 6501531641 is about 1866.4021532328.

Adding to 6501531641 its reverse (1461351056), we get a palindrome (7962882697).

The spelling of 6501531641 in words is "six billion, five hundred one million, five hundred thirty-one thousand, six hundred forty-one".