311489977 has 4 divisors (see below), whose sum is σ = 311539060. Its totient is φ = 311440896.

The previous prime is 311489951. The next prime is 311489987. The reversal of 311489977 is 779984113.

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 105596176 + 205893801 = 10276^2 + 14349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311489977 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 311489977.

It is not an unprimeable number, because it can be changed into a prime (311489987) 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, 13308 + ... + 28285.

It is an arithmetic number, because the mean of its divisors is an integer number (77884765).

Almost surely, 2^311489977 is an apocalyptic number.

It is an amenable number.

311489977 is a deficient number, since it is larger than the sum of its proper divisors (49083).

311489977 is an equidigital number, since it uses as much as digits as its factorization.

311489977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49082.

The product of its digits is 381024, while the sum is 49.

The square root of 311489977 is about 17649.0786445072. The cubic root of 311489977 is about 677.8725152821.

The spelling of 311489977 in words is "three hundred eleven million, four hundred eighty-nine thousand, nine hundred seventy-seven".