311020321 has 4 divisors (see below), whose sum is σ = 329315652. Its totient is φ = 292724992.

The previous prime is 311020319. The next prime is 311020327. The reversal of 311020321 is 123020113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 83010321 + 228010000 = 9111^2 + 15100^2 .

It is a cyclic number.

It is not a de Polignac number, because 311020321 - 2¹ = 311020319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311020327) 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, 9147640 + ... + 9147673.

It is an arithmetic number, because the mean of its divisors is an integer number (82328913).

Almost surely, 2^311020321 is an apocalyptic number.

It is an amenable number.

311020321 is a deficient number, since it is larger than the sum of its proper divisors (18295331).

311020321 is a wasteful number, since it uses less digits than its factorization.

311020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295330.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 311020321 is about 17635.7682282343. The cubic root of 311020321 is about 677.5316514127.

Adding to 311020321 its reverse (123020113), we get a palindrome (434040434).

The spelling of 311020321 in words is "three hundred eleven million, twenty thousand, three hundred twenty-one".