311032321 has 4 divisors (see below), whose sum is σ = 311185152. Its totient is φ = 310879492.

The previous prime is 311032313. The next prime is 311032339. The reversal of 311032321 is 123230113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123230113 = 23 ⋅5357831.

It is a cyclic number.

It is not a de Polignac number, because 311032321 - 2³ = 311032313 is a prime.

It is a super-2 number, since 2×311032321² = 193482209413294082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311032295 and 311032304.

It is not an unprimeable number, because it can be changed into a prime (311032301) 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, 73321 + ... + 77446.

It is an arithmetic number, because the mean of its divisors is an integer number (77796288).

Almost surely, 2^311032321 is an apocalyptic number.

It is an amenable number.

311032321 is a deficient number, since it is larger than the sum of its proper divisors (152831).

311032321 is a wasteful number, since it uses less digits than its factorization.

311032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152830.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 311032321 is about 17636.1084426242. The cubic root of 311032321 is about 677.5403649648.

Adding to 311032321 its reverse (123230113), we get a palindrome (434262434).

The spelling of 311032321 in words is "three hundred eleven million, thirty-two thousand, three hundred twenty-one".