311311005 has 16 divisors (see below), whose sum is σ = 504100800. Its totient is φ = 164031488.

The previous prime is 311310983. The next prime is 311311009. The reversal of 311311005 is 500113113.

It is a cyclic number.

It is not a de Polignac number, because 311311005 - 2¹⁷ = 311179933 is a prime.

It is a super-2 number, since 2×311311005² = 193829083668220050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311311009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123780 + ... + 126269.

It is an arithmetic number, because the mean of its divisors is an integer number (31506300).

Almost surely, 2^311311005 is an apocalyptic number.

It is an amenable number.

311311005 is a deficient number, since it is larger than the sum of its proper divisors (192789795).

311311005 is a wasteful number, since it uses less digits than its factorization.

311311005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250140.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 311311005 is about 17644.0076229863. The cubic root of 311311005 is about 677.7426625830.

Adding to 311311005 its reverse (500113113), we get a palindrome (811424118).

The spelling of 311311005 in words is "three hundred eleven million, three hundred eleven thousand, five".