321431134091 has 4 divisors (see below), whose sum is σ = 331799880384. Its totient is φ = 311062387800.

The previous prime is 321431134021. The next prime is 321431134093. The reversal of 321431134091 is 190431134123.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321431134091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321431134093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5184373100 + ... + 5184373161.

It is an arithmetic number, because the mean of its divisors is an integer number (82949970096).

Almost surely, 2^321431134091 is an apocalyptic number.

321431134091 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

321431134091 is a deficient number, since it is larger than the sum of its proper divisors (10368746293).

321431134091 is a wasteful number, since it uses less digits than its factorization.

321431134091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368746292.

The product of its (nonzero) digits is 7776, while the sum is 32.

Adding to 321431134091 its sum of digits (32), we get a palindrome (321431134123).

The spelling of 321431134091 in words is "three hundred twenty-one billion, four hundred thirty-one million, one hundred thirty-four thousand, ninety-one".