311164657981 has 6 divisors (see below), whose sum is σ = 315153315582. Its totient is φ = 307225858680.

The previous prime is 311164657967. The next prime is 311164658011. The reversal of 311164657981 is 189756461113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 310545394756 + 619263225 = 557266^2 + 24885^2 .

It is not a de Polignac number, because 311164657981 - 2¹⁷ = 311164526909 is a prime.

It is a super-2 number, since 2×311164657981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311164657961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24922830 + ... + 24935311.

It is an arithmetic number, because the mean of its divisors is an integer number (52525552597).

Almost surely, 2^311164657981 is an apocalyptic number.

It is an amenable number.

311164657981 is a deficient number, since it is larger than the sum of its proper divisors (3988657601).

311164657981 is an frugal number, since it uses more digits than its factorization.

311164657981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49858299 (or 49858220 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The spelling of 311164657981 in words is "three hundred eleven billion, one hundred sixty-four million, six hundred fifty-seven thousand, nine hundred eighty-one".