315221235331 has 2 divisors, whose sum is σ = 315221235332. Its totient is φ = 315221235330.

The previous prime is 315221235313. The next prime is 315221235409. The reversal of 315221235331 is 133532122513.

Together with previous prime (315221235313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315221235331 - 2⁹ = 315221234819 is a prime.

It is a super-2 number, since 2×315221235331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315221235293 and 315221235302.

It is not a weakly prime, because it can be changed into another prime (315221233331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157610617665 + 157610617666.

It is an arithmetic number, because the mean of its divisors is an integer number (157610617666).

Almost surely, 2^315221235331 is an apocalyptic number.

315221235331 is a deficient number, since it is larger than the sum of its proper divisors (1).

315221235331 is an equidigital number, since it uses as much as digits as its factorization.

315221235331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 31.

Adding to 315221235331 its reverse (133532122513), we get a palindrome (448753357844).

The spelling of 315221235331 in words is "three hundred fifteen billion, two hundred twenty-one million, two hundred thirty-five thousand, three hundred thirty-one".