311350021 has 4 divisors (see below), whose sum is σ = 316627200. Its totient is φ = 306072844.

The previous prime is 311350009. The next prime is 311350031. The reversal of 311350021 is 120053113.

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 311350021 - 2⁵ = 311349989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311349977 and 311350004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311350001) 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, 2638501 + ... + 2638618.

It is an arithmetic number, because the mean of its divisors is an integer number (79156800).

Almost surely, 2^311350021 is an apocalyptic number.

It is an amenable number.

311350021 is a deficient number, since it is larger than the sum of its proper divisors (5277179).

311350021 is an equidigital number, since it uses as much as digits as its factorization.

311350021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277178.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 311350021 is about 17645.1132328472. The cubic root of 311350021 is about 677.7709747881.

The spelling of 311350021 in words is "three hundred eleven million, three hundred fifty thousand, twenty-one".