311688077 has 4 divisors (see below), whose sum is σ = 312465756. Its totient is φ = 310910400.

The previous prime is 311688073. The next prime is 311688079. The reversal of 311688077 is 770886113.

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 284293321 + 27394756 = 16861^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 311688077 - 2² = 311688073 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 (311688073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388238 + ... + 389039.

It is an arithmetic number, because the mean of its divisors is an integer number (78116439).

Almost surely, 2^311688077 is an apocalyptic number.

It is an amenable number.

311688077 is a deficient number, since it is larger than the sum of its proper divisors (777679).

311688077 is an equidigital number, since it uses as much as digits as its factorization.

311688077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777678.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 311688077 is about 17654.6899434683. The cubic root of 311688077 is about 678.0161882706.

The spelling of 311688077 in words is "three hundred eleven million, six hundred eighty-eight thousand, seventy-seven".