321125663 has 4 divisors (see below), whose sum is σ = 324071880. Its totient is φ = 318179448.

The previous prime is 321125659. The next prime is 321125681. The reversal of 321125663 is 366521123.

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 321125663 - 2² = 321125659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321125603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472945 + ... + 1473162.

It is an arithmetic number, because the mean of its divisors is an integer number (81017970).

Almost surely, 2^321125663 is an apocalyptic number.

321125663 is a deficient number, since it is larger than the sum of its proper divisors (2946217).

321125663 is a wasteful number, since it uses less digits than its factorization.

321125663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946216.

The product of its digits is 6480, while the sum is 29.

The square root of 321125663 is about 17919.9794363721. The cubic root of 321125663 is about 684.7914636848.

Adding to 321125663 its reverse (366521123), we get a palindrome (687646786).

The spelling of 321125663 in words is "three hundred twenty-one million, one hundred twenty-five thousand, six hundred sixty-three".