311311212303 has 96 divisors (see below), whose sum is σ = 527308185600. Its totient is φ = 161903798784.

The previous prime is 311311212299. The next prime is 311311212307. The reversal of 311311212303 is 303212113113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (311311212299) and next prime (311311212307).

It is not a de Polignac number, because 311311212303 - 2² = 311311212299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 311311212303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311311212307) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 216337858 + ... + 216339296.

It is an arithmetic number, because the mean of its divisors is an integer number (5492793600).

Almost surely, 2^311311212303 is an apocalyptic number.

311311212303 is a deficient number, since it is larger than the sum of its proper divisors (215996973297).

311311212303 is a wasteful number, since it uses less digits than its factorization.

311311212303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981 (or 2974 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 311311212303 its reverse (303212113113), we get a palindrome (614523325416).

The spelling of 311311212303 in words is "three hundred eleven billion, three hundred eleven million, two hundred twelve thousand, three hundred three".