6531512340 has 48 divisors (see below), whose sum is σ = 18291748608. Its totient is φ = 1741401984.

The previous prime is 6531512329. The next prime is 6531512347. The reversal of 6531512340 is 432151356.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 6531512298 and 6531512307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531512347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578994 + ... + 590166.

It is an arithmetic number, because the mean of its divisors is an integer number (381078096).

Almost surely, 2^6531512340 is an apocalyptic number.

6531512340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6531512340 is an abundant number, since it is smaller than the sum of its proper divisors (11760236268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6531512340 is a wasteful number, since it uses less digits than its factorization.

6531512340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20928 (or 20926 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 6531512340 is about 80817.7724266142. The cubic root of 6531512340 is about 1869.2666192982.

Adding to 6531512340 its reverse (432151356), we get a palindrome (6963663696).

The spelling of 6531512340 in words is "six billion, five hundred thirty-one million, five hundred twelve thousand, three hundred forty".