321401231 has 4 divisors (see below), whose sum is σ = 321458712. Its totient is φ = 321343752.

The previous prime is 321401209. The next prime is 321401251. The reversal of 321401231 is 132104123.

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-321401231 is a prime.

It is a super-2 number, since 2×321401231² = 206597502576630722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321401251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19325 + ... + 31878.

It is an arithmetic number, because the mean of its divisors is an integer number (80364678).

Almost surely, 2^321401231 is an apocalyptic number.

321401231 is a deficient number, since it is larger than the sum of its proper divisors (57481).

321401231 is an equidigital number, since it uses as much as digits as its factorization.

321401231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57480.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 321401231 is about 17927.6666356779. Note that the first 4 decimals coincide. The cubic root of 321401231 is about 684.9872880231.

Adding to 321401231 its reverse (132104123), we get a palindrome (453505354).

The spelling of 321401231 in words is "three hundred twenty-one million, four hundred one thousand, two hundred thirty-one".