326427531391 has 16 divisors (see below), whose sum is σ = 370548505600. Its totient is φ = 285066083808.

The previous prime is 326427531373. The next prime is 326427531401. The reversal of 326427531391 is 193135724623.

It is a cyclic number.

It is not a de Polignac number, because 326427531391 - 2¹⁷ = 326427400319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326427531341) 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 15 ways as a sum of consecutive naturals, for example, 729351 + ... + 1088488.

It is an arithmetic number, because the mean of its divisors is an integer number (23159281600).

Almost surely, 2^326427531391 is an apocalyptic number.

326427531391 is a deficient number, since it is larger than the sum of its proper divisors (44120974209).

326427531391 is a wasteful number, since it uses less digits than its factorization.

326427531391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818598.

The product of its digits is 816480, while the sum is 46.

The spelling of 326427531391 in words is "three hundred twenty-six billion, four hundred twenty-seven million, five hundred thirty-one thousand, three hundred ninety-one".