311431103 has 4 divisors (see below), whose sum is σ = 311486640. Its totient is φ = 311375568.

The previous prime is 311431093. The next prime is 311431117. The reversal of 311431103 is 301134113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311431103 - 2¹² = 311427007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18275 + ... + 30932.

It is an arithmetic number, because the mean of its divisors is an integer number (77871660).

Almost surely, 2^311431103 is an apocalyptic number.

311431103 is a deficient number, since it is larger than the sum of its proper divisors (55537).

311431103 is an equidigital number, since it uses as much as digits as its factorization.

311431103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55536.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 311431103 is about 17647.4106599240. The cubic root of 311431103 is about 677.8298048858.

Adding to 311431103 its reverse (301134113), we get a palindrome (612565216).

The spelling of 311431103 in words is "three hundred eleven million, four hundred thirty-one thousand, one hundred three".