311312213031 has 8 divisors (see below), whose sum is σ = 415089282544. Its totient is φ = 207538309440.

The previous prime is 311312213027. The next prime is 311312213117. The reversal of 311312213031 is 130312213113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 311312213031 - 2² = 311312213027 is a prime.

It is a super-2 number, since 2×311312213031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311312212989 and 311312213007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311312213021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551656 + ... + 962781.

It is an arithmetic number, because the mean of its divisors is an integer number (51886160318).

Almost surely, 2^311312213031 is an apocalyptic number.

311312213031 is a deficient number, since it is larger than the sum of its proper divisors (103777069513).

311312213031 is a wasteful number, since it uses less digits than its factorization.

311312213031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582961.

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

Adding to 311312213031 its reverse (130312213113), we get a palindrome (441624426144).

The spelling of 311312213031 in words is "three hundred eleven billion, three hundred twelve million, two hundred thirteen thousand, thirty-one".