311231132133133 has 4 divisors (see below), whose sum is σ = 312388125189660. Its totient is φ = 310074139076608.

The previous prime is 311231132133083. The next prime is 311231132133157. The reversal of 311231132133133 is 331331231132113.

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 53728870680004 + 257502261453129 = 7329998^2 + 16046877^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311231132133133 is a prime.

It is a super-2 number, since 2×311231132133133² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311231132133095 and 311231132133104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311231132133433) 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, 578496527860 + ... + 578496528397.

It is an arithmetic number, because the mean of its divisors is an integer number (78097031297415).

Almost surely, 2^{311231132133133} is an apocalyptic number.

It is an amenable number.

311231132133133 is a deficient number, since it is larger than the sum of its proper divisors (1156993056527).

311231132133133 is a wasteful number, since it uses less digits than its factorization.

311231132133133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156993056526.

The product of its digits is 8748, while the sum is 31.

Adding to 311231132133133 its reverse (331331231132113), we get a palindrome (642562363265246).

The spelling of 311231132133133 in words is "three hundred eleven trillion, two hundred thirty-one billion, one hundred thirty-two million, one hundred thirty-three thousand, one hundred thirty-three".