311153512381 has 2 divisors, whose sum is σ = 311153512382. Its totient is φ = 311153512380.

The previous prime is 311153512349. The next prime is 311153512391. The reversal of 311153512381 is 183215351113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263589828100 + 47563684281 = 513410^2 + 218091^2 .

It is a cyclic number.

It is not a de Polignac number, because 311153512381 - 2⁵ = 311153512349 is a prime.

It is a super-2 number, since 2×311153512381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311153512301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155576756190 + 155576756191.

It is an arithmetic number, because the mean of its divisors is an integer number (155576756191).

Almost surely, 2^311153512381 is an apocalyptic number.

It is an amenable number.

311153512381 is a deficient number, since it is larger than the sum of its proper divisors (1).

311153512381 is an equidigital number, since it uses as much as digits as its factorization.

311153512381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

Adding to 311153512381 its reverse (183215351113), we get a palindrome (494368863494).

The spelling of 311153512381 in words is "three hundred eleven billion, one hundred fifty-three million, five hundred twelve thousand, three hundred eighty-one".