311313021 has 16 divisors (see below), whose sum is σ = 423197184. Its totient is φ = 203513904.

The previous prime is 311313019. The next prime is 311313029. The reversal of 311313021 is 120313113.

It is not a de Polignac number, because 311313021 - 2¹ = 311313019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311313029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42216 + ... + 49038.

It is an arithmetic number, because the mean of its divisors is an integer number (26449824).

Almost surely, 2^311313021 is an apocalyptic number.

It is an amenable number.

311313021 is a deficient number, since it is larger than the sum of its proper divisors (111884163).

311313021 is a wasteful number, since it uses less digits than its factorization.

311313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 311313021 is about 17644.0647527717. The cubic root of 311313021 is about 677.7441255640.

Adding to 311313021 its reverse (120313113), we get a palindrome (431626134).

The spelling of 311313021 in words is "three hundred eleven million, three hundred thirteen thousand, twenty-one".