311780884133 has 4 divisors (see below), whose sum is σ = 313142372940. Its totient is φ = 310419395328.

The previous prime is 311780884091. The next prime is 311780884141. The reversal of 311780884133 is 331488087113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331488087113 = 19 ⋅17446741427.

It can be written as a sum of positive squares in 2 ways, for example, as 237771313924 + 74009570209 = 487618^2 + 272047^2 .

It is a cyclic number.

It is not a de Polignac number, because 311780884133 - 2⁶ = 311780884069 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 (311780884193) 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, 680744060 + ... + 680744517.

It is an arithmetic number, because the mean of its divisors is an integer number (78285593235).

Almost surely, 2^311780884133 is an apocalyptic number.

It is an amenable number.

311780884133 is a deficient number, since it is larger than the sum of its proper divisors (1361488807).

311780884133 is a wasteful number, since it uses less digits than its factorization.

311780884133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361488806.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 311780884133 in words is "three hundred eleven billion, seven hundred eighty million, eight hundred eighty-four thousand, one hundred thirty-three".