311240861 has 4 divisors (see below), whose sum is σ = 311301312. Its totient is φ = 311180412.

The previous prime is 311240827. The next prime is 311240863. The reversal of 311240861 is 168042113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311240861 - 2²² = 307046557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311240861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311240863) 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, 21701 + ... + 33066.

It is an arithmetic number, because the mean of its divisors is an integer number (77825328).

Almost surely, 2^311240861 is an apocalyptic number.

It is an amenable number.

311240861 is a deficient number, since it is larger than the sum of its proper divisors (60451).

311240861 is an equidigital number, since it uses as much as digits as its factorization.

311240861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60450.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 311240861 is about 17642.0197539851. The cubic root of 311240861 is about 677.6917561994.

Adding to 311240861 its reverse (168042113), we get a palindrome (479282974).

The spelling of 311240861 in words is "three hundred eleven million, two hundred forty thousand, eight hundred sixty-one".