311431310304421 has 4 divisors (see below), whose sum is σ = 319027195921644. Its totient is φ = 303835424687200.

The previous prime is 311431310304343. The next prime is 311431310304479. The reversal of 311431310304421 is 124403013134113.

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 45098343180900 + 266332967123521 = 6715530^2 + 16319711^2 .

It is a cyclic number.

It is not a de Polignac number, because 311431310304421 - 2²¹ = 311431308207269 is a prime.

It is a super-2 number, since 2×311431310304421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431310304481) 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, 3797942808550 + ... + 3797942808631.

It is an arithmetic number, because the mean of its divisors is an integer number (79756798980411).

Almost surely, 2^{311431310304421} is an apocalyptic number.

It is an amenable number.

311431310304421 is a deficient number, since it is larger than the sum of its proper divisors (7595885617223).

311431310304421 is an equidigital number, since it uses as much as digits as its factorization.

311431310304421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7595885617222.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 311431310304421 its reverse (124403013134113), we get a palindrome (435834323438534).

The spelling of 311431310304421 in words is "three hundred eleven trillion, four hundred thirty-one billion, three hundred ten million, three hundred four thousand, four hundred twenty-one".