311212531145 has 32 divisors (see below), whose sum is σ = 392313618432. Its totient is φ = 236545892352.

The previous prime is 311212531141. The next prime is 311212531229. The reversal of 311212531145 is 541135212113.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 311212531145 - 2² = 311212531141 is a prime.

It is a super-2 number, since 2×311212531145² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311212531141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22932152 + ... + 22945718.

It is an arithmetic number, because the mean of its divisors is an integer number (12259800576).

Almost surely, 2^311212531145 is an apocalyptic number.

It is an amenable number.

311212531145 is a deficient number, since it is larger than the sum of its proper divisors (81101087287).

311212531145 is a wasteful number, since it uses less digits than its factorization.

311212531145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14921.

The product of its digits is 3600, while the sum is 29.

Adding to 311212531145 its reverse (541135212113), we get a palindrome (852347743258).

The spelling of 311212531145 in words is "three hundred eleven billion, two hundred twelve million, five hundred thirty-one thousand, one hundred forty-five".