311541023161 has 4 divisors (see below), whose sum is σ = 319961050852. Its totient is φ = 303120995472.

The previous prime is 311541023159. The next prime is 311541023173. The reversal of 311541023161 is 161320145113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161320145113 = 857 ⋅188238209.

It can be written as a sum of positive squares in 2 ways, for example, as 251843385600 + 59697637561 = 501840^2 + 244331^2 .

It is a cyclic number.

It is not a de Polignac number, because 311541023161 - 2¹ = 311541023159 is a prime.

It is a super-2 number, since 2×311541023161² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311541023191) 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, 4210013790 + ... + 4210013863.

It is an arithmetic number, because the mean of its divisors is an integer number (79990262713).

Almost surely, 2^311541023161 is an apocalyptic number.

It is an amenable number.

311541023161 is a deficient number, since it is larger than the sum of its proper divisors (8420027691).

311541023161 is an equidigital number, since it uses as much as digits as its factorization.

311541023161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8420027690.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 311541023161 its reverse (161320145113), we get a palindrome (472861168274).

The spelling of 311541023161 in words is "three hundred eleven billion, five hundred forty-one million, twenty-three thousand, one hundred sixty-one".