311221040005 has 8 divisors (see below), whose sum is σ = 373476112632. Its totient is φ = 248969588928.

The previous prime is 311221039981. The next prime is 311221040033. The reversal of 311221040005 is 500040122113.

It can be written as a sum of positive squares in 4 ways, for example, as 18532465956 + 292688574049 = 136134^2 + 541007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311221040005 - 2⁵ = 311221039973 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 712594 + ... + 1063123.

It is an arithmetic number, because the mean of its divisors is an integer number (46684514079).

Almost surely, 2^311221040005 is an apocalyptic number.

It is an amenable number.

311221040005 is a deficient number, since it is larger than the sum of its proper divisors (62255072627).

311221040005 is a wasteful number, since it uses less digits than its factorization.

311221040005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810775.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 311221040005 its reverse (500040122113), we get a palindrome (811261162118).

The spelling of 311221040005 in words is "three hundred eleven billion, two hundred twenty-one million, forty thousand, five".