311312345 has 4 divisors (see below), whose sum is σ = 373574820. Its totient is φ = 249049872.

The previous prime is 311312329. The next prime is 311312363. The reversal of 311312345 is 543213113.

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 50069776 + 261242569 = 7076^2 + 16163^2 .

It is a cyclic number.

It is not a de Polignac number, because 311312345 - 2⁴ = 311312329 is a prime.

It is a super-2 number, since 2×311312345² = 193830752298798050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 311312345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31131230 + ... + 31131239.

It is an arithmetic number, because the mean of its divisors is an integer number (93393705).

Almost surely, 2^311312345 is an apocalyptic number.

It is an amenable number.

311312345 is a deficient number, since it is larger than the sum of its proper divisors (62262475).

311312345 is an equidigital number, since it uses as much as digits as its factorization.

311312345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62262474.

The product of its digits is 1080, while the sum is 23.

The square root of 311312345 is about 17644.0455961778. The cubic root of 311312345 is about 677.7436350016.

Adding to 311312345 its reverse (543213113), we get a palindrome (854525458).

The spelling of 311312345 in words is "three hundred eleven million, three hundred twelve thousand, three hundred forty-five".