311123011 has 4 divisors (see below), whose sum is σ = 311262400. Its totient is φ = 310983624.

The previous prime is 311122993. The next prime is 311123023. The reversal of 311123011 is 110321113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110321113 = 7 ⋅15760159.

It is a cyclic number.

It is not a de Polignac number, because 311123011 - 2¹³ = 311114819 is a prime.

It is a super-2 number, since 2×311123011² = 193595055947412242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311122982 and 311123000.

It is not an unprimeable number, because it can be changed into a prime (311123041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66291 + ... + 70828.

It is an arithmetic number, because the mean of its divisors is an integer number (77815600).

Almost surely, 2^311123011 is an apocalyptic number.

311123011 is a deficient number, since it is larger than the sum of its proper divisors (139389).

311123011 is a wasteful number, since it uses less digits than its factorization.

311123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139388.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 311123011 is about 17638.6794006808. The cubic root of 311123011 is about 677.6062103881.

Adding to 311123011 its reverse (110321113), we get a palindrome (421444124).

The spelling of 311123011 in words is "three hundred eleven million, one hundred twenty-three thousand, eleven".