311230153121 has 4 divisors (see below), whose sum is σ = 312810001812. Its totient is φ = 309650304432.

The previous prime is 311230153111. The next prime is 311230153141. The reversal of 311230153121 is 121351032113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 297875808400 + 13354344721 = 545780^2 + 115561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311230153121 is a prime.

It is a super-2 number, since 2×311230153121² (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 (311230153111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789924050 + ... + 789924443.

It is an arithmetic number, because the mean of its divisors is an integer number (78202500453).

Almost surely, 2^311230153121 is an apocalyptic number.

It is an amenable number.

311230153121 is a deficient number, since it is larger than the sum of its proper divisors (1579848691).

311230153121 is a wasteful number, since it uses less digits than its factorization.

311230153121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579848690.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 311230153121 its reverse (121351032113), we get a palindrome (432581185234).

The spelling of 311230153121 in words is "three hundred eleven billion, two hundred thirty million, one hundred fifty-three thousand, one hundred twenty-one".