6531398397 has 24 divisors (see below), whose sum is σ = 9712553760. Its totient is φ = 4226381280.

The previous prime is 6531398311. The next prime is 6531398407. The reversal of 6531398397 is 7938931356.

It is not a de Polignac number, because 6531398397 - 2¹⁸ = 6531136253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6530398397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116122 + ... + 162932.

It is an arithmetic number, because the mean of its divisors is an integer number (404689740).

Almost surely, 2^6531398397 is an apocalyptic number.

It is an amenable number.

6531398397 is a deficient number, since it is larger than the sum of its proper divisors (3181155363).

6531398397 is a wasteful number, since it uses less digits than its factorization.

6531398397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47273 (or 47270 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 6531398397 is about 80817.0674857731. The cubic root of 6531398397 is about 1869.2557493764.

The spelling of 6531398397 in words is "six billion, five hundred thirty-one million, three hundred ninety-eight thousand, three hundred ninety-seven".