311121263 has 2 divisors, whose sum is σ = 311121264. Its totient is φ = 311121262.

The previous prime is 311121259. The next prime is 311121269. The reversal of 311121263 is 362121113.

It is a weak prime.

It is an emirp because it is prime and its reverse (362121113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311121263 - 2² = 311121259 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311121269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560631 + 155560632.

It is an arithmetic number, because the mean of its divisors is an integer number (155560632).

Almost surely, 2^311121263 is an apocalyptic number.

311121263 is a deficient number, since it is larger than the sum of its proper divisors (1).

311121263 is an equidigital number, since it uses as much as digits as its factorization.

311121263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 311121263 is about 17638.6298504164. The cubic root of 311121263 is about 677.6049413747.

Adding to 311121263 its reverse (362121113), we get a palindrome (673242376).

The spelling of 311121263 in words is "three hundred eleven million, one hundred twenty-one thousand, two hundred sixty-three".