6531320249 has 4 divisors (see below), whose sum is σ = 6535860480. Its totient is φ = 6526780020.

The previous prime is 6531320239. The next prime is 6531320251. The reversal of 6531320249 is 9420231356.

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 a de Polignac number, because none of the positive numbers 2^k-6531320249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6531320209) 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, 2267957 + ... + 2270834.

It is an arithmetic number, because the mean of its divisors is an integer number (1633965120).

Almost surely, 2^6531320249 is an apocalyptic number.

It is an amenable number.

6531320249 is a deficient number, since it is larger than the sum of its proper divisors (4540231).

6531320249 is a wasteful number, since it uses less digits than its factorization.

6531320249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540230.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 6531320249 is about 80816.5839973455. The cubic root of 6531320249 is about 1869.2482941490.

The spelling of 6531320249 in words is "six billion, five hundred thirty-one million, three hundred twenty thousand, two hundred forty-nine".