311428729 has 8 divisors (see below), whose sum is σ = 335154888. Its totient is φ = 288303360.

The previous prime is 311428723. The next prime is 311428739. The reversal of 311428729 is 927824113.

It can be written as a sum of positive squares in 4 ways, for example, as 6996025 + 304432704 = 2645^2 + 17448^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311428729 - 2¹⁹ = 310904441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311428723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149122 + ... + 151195.

It is an arithmetic number, because the mean of its divisors is an integer number (41894361).

Almost surely, 2^311428729 is an apocalyptic number.

It is an amenable number.

311428729 is a deficient number, since it is larger than the sum of its proper divisors (23726159).

311428729 is a wasteful number, since it uses less digits than its factorization.

311428729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300395.

The product of its digits is 24192, while the sum is 37.

The square root of 311428729 is about 17647.3433978035. The cubic root of 311428729 is about 677.8280825444.

The spelling of 311428729 in words is "three hundred eleven million, four hundred twenty-eight thousand, seven hundred twenty-nine".