311321005 has 16 divisors (see below), whose sum is σ = 376746048. Its totient is φ = 246960000.

The previous prime is 311320991. The next prime is 311321011. The reversal of 311321005 is 500123113.

It is not a de Polignac number, because 311321005 - 2¹⁷ = 311189933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311321005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517705 + ... + 518305.

It is an arithmetic number, because the mean of its divisors is an integer number (23546628).

Almost surely, 2^311321005 is an apocalyptic number.

It is an amenable number.

311321005 is a deficient number, since it is larger than the sum of its proper divisors (65425043).

311321005 is a wasteful number, since it uses less digits than its factorization.

311321005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 311321005 is about 17644.2910030412. The cubic root of 311321005 is about 677.7499193712.

Adding to 311321005 its reverse (500123113), we get a palindrome (811444118).

The spelling of 311321005 in words is "three hundred eleven million, three hundred twenty-one thousand, five".