6531391402 has 8 divisors (see below), whose sum is σ = 9801690912. Its totient is φ = 3264161100.

The previous prime is 6531391393. The next prime is 6531391403. The reversal of 6531391402 is 2041931356.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6531391402² = 85318147292239051208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6531391403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761974 + ... + 770497.

It is an arithmetic number, because the mean of its divisors is an integer number (1225211364).

Almost surely, 2^6531391402 is an apocalyptic number.

6531391402 is a deficient number, since it is larger than the sum of its proper divisors (3270299510).

6531391402 is a wasteful number, since it uses less digits than its factorization.

6531391402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534604.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 6531391402 is about 80817.0242090118. The cubic root of 6531391402 is about 1869.2550820640.

The spelling of 6531391402 in words is "six billion, five hundred thirty-one million, three hundred ninety-one thousand, four hundred two".