311243142242 has 6 divisors (see below), whose sum is σ = 466865896833. Its totient is φ = 155621176632.

The previous prime is 311243142233. The next prime is 311243142257. The reversal of 311243142242 is 242241342113.

It can be written as a sum of positive squares in 2 ways, for example, as 188329092961 + 122914049281 = 433969^2 + 350591^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=394489.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 591734 + ... + 986222.

Almost surely, 2^311243142242 is an apocalyptic number.

311243142242 is a deficient number, since it is larger than the sum of its proper divisors (155622754591).

311243142242 is an frugal number, since it uses more digits than its factorization.

311243142242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788980 (or 394491 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

Adding to 311243142242 its reverse (242241342113), we get a palindrome (553484484355).

The spelling of 311243142242 in words is "three hundred eleven billion, two hundred forty-three million, one hundred forty-two thousand, two hundred forty-two".