321343786531 has 4 divisors (see below), whose sum is σ = 321506659152. Its totient is φ = 321180913912.

The previous prime is 321343786529. The next prime is 321343786537. The reversal of 321343786531 is 135687343123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321343786531 - 2¹ = 321343786529 is a prime.

It is a super-2 number, since 2×321343786531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321343786537) 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, 81433351 + ... + 81437296.

It is an arithmetic number, because the mean of its divisors is an integer number (80376664788).

Almost surely, 2^321343786531 is an apocalyptic number.

321343786531 is a deficient number, since it is larger than the sum of its proper divisors (162872621).

321343786531 is a wasteful number, since it uses less digits than its factorization.

321343786531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162872620.

The product of its digits is 1088640, while the sum is 46.

The spelling of 321343786531 in words is "three hundred twenty-one billion, three hundred forty-three million, seven hundred eighty-six thousand, five hundred thirty-one".