6531320251 has 2 divisors, whose sum is σ = 6531320252. Its totient is φ = 6531320250.

The previous prime is 6531320239. The next prime is 6531320297. The reversal of 6531320251 is 1520231356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6531320251 - 2⁷ = 6531320123 is a prime.

It is a super-2 number, since 2×6531320251² = 85316288442245406002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6531323251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265660125 + 3265660126.

It is an arithmetic number, because the mean of its divisors is an integer number (3265660126).

Almost surely, 2^6531320251 is an apocalyptic number.

6531320251 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531320251 is an equidigital number, since it uses as much as digits as its factorization.

6531320251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 6531320251 is about 80816.5840097192. The cubic root of 6531320251 is about 1869.2482943398.

The spelling of 6531320251 in words is "six billion, five hundred thirty-one million, three hundred twenty thousand, two hundred fifty-one".