321316387 has 4 divisors (see below), whose sum is σ = 367218736. Its totient is φ = 275414040.

The previous prime is 321316367. The next prime is 321316397. The reversal of 321316387 is 783613123.

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-321316387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321316327) 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, 22951164 + ... + 22951177.

It is an arithmetic number, because the mean of its divisors is an integer number (91804684).

Almost surely, 2^321316387 is an apocalyptic number.

321316387 is a deficient number, since it is larger than the sum of its proper divisors (45902349).

321316387 is an equidigital number, since it uses as much as digits as its factorization.

321316387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45902348.

The product of its digits is 18144, while the sum is 34.

The square root of 321316387 is about 17925.3001927443. The cubic root of 321316387 is about 684.9270080464.

It can be divided in two parts, 3213 and 16387, that added together give a square (19600 = 140²).

The spelling of 321316387 in words is "three hundred twenty-one million, three hundred sixteen thousand, three hundred eighty-seven".