311075023081 has 3 divisors (see below), whose sum is σ = 311075580823. Its totient is φ = 311074465340.

The previous prime is 311075023043. The next prime is 311075023087. The reversal of 311075023081 is 180320570113.

The square root of 311075023081 is 557741.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 308348094681 + 2726928400 = 555291^2 + 52220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-311075023081 is a prime.

It is a super-2 number, since 2×311075023081² (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 (311075023087) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 278871 + ... + 836611.

Almost surely, 2^311075023081 is an apocalyptic number.

311075023081 is the 557741-st square number.

311075023081 is the 278871-st centered octagonal number.

It is an amenable number.

311075023081 is a deficient number, since it is larger than the sum of its proper divisors (557742).

311075023081 is an frugal number, since it uses more digits than its factorization.

311075023081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115482 (or 557741 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 311075023081 its reverse (180320570113), we get a palindrome (491395593194).

The spelling of 311075023081 in words is "three hundred eleven billion, seventy-five million, twenty-three thousand, eighty-one".