311620021163 has 4 divisors (see below), whose sum is σ = 339949114008. Its totient is φ = 283290928320.

The previous prime is 311620021129. The next prime is 311620021169. The reversal of 311620021163 is 361120026113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311620021163 - 2¹⁰ = 311620020139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311620021169) 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, 14164546406 + ... + 14164546427.

It is an arithmetic number, because the mean of its divisors is an integer number (84987278502).

Almost surely, 2^311620021163 is an apocalyptic number.

311620021163 is a deficient number, since it is larger than the sum of its proper divisors (28329092845).

311620021163 is a wasteful number, since it uses less digits than its factorization.

311620021163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28329092844.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 311620021163 its reverse (361120026113), we get a palindrome (672740047276).

The spelling of 311620021163 in words is "three hundred eleven billion, six hundred twenty million, twenty-one thousand, one hundred sixty-three".