311980105 has 4 divisors (see below), whose sum is σ = 374376132. Its totient is φ = 249584080.

The previous prime is 311980103. The next prime is 311980121. The reversal of 311980105 is 501089113.

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 234610489 + 77369616 = 15317^2 + 8796^2 .

It is not a de Polignac number, because 311980105 - 2¹ = 311980103 is a prime.

It is a super-2 number, since 2×311980105² = 194663171831622050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311980103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31198006 + ... + 31198015.

It is an arithmetic number, because the mean of its divisors is an integer number (93594033).

Almost surely, 2^311980105 is an apocalyptic number.

It is an amenable number.

311980105 is a deficient number, since it is larger than the sum of its proper divisors (62396027).

311980105 is an equidigital number, since it uses as much as digits as its factorization.

311980105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62396026.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 311980105 is about 17662.9585573878. The cubic root of 311980105 is about 678.2278720247.

The spelling of 311980105 in words is "three hundred eleven million, nine hundred eighty thousand, one hundred five".