312501331 has 2 divisors, whose sum is σ = 312501332. Its totient is φ = 312501330.

The previous prime is 312501307. The next prime is 312501349. The reversal of 312501331 is 133105213.

It is a strong prime.

It is an emirp because it is prime and its reverse (133105213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312501331 is a prime.

It is a super-2 number, since 2×312501331² = 195314163753543122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312501299 and 312501308.

It is not a weakly prime, because it can be changed into another prime (312501031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156250665 + 156250666.

It is an arithmetic number, because the mean of its divisors is an integer number (156250666).

Almost surely, 2^312501331 is an apocalyptic number.

312501331 is a deficient number, since it is larger than the sum of its proper divisors (1).

312501331 is an equidigital number, since it uses as much as digits as its factorization.

312501331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 312501331 is about 17677.7071759886. The cubic root of 312501331 is about 678.6053675847.

Adding to 312501331 its reverse (133105213), we get a palindrome (445606544).

The spelling of 312501331 in words is "three hundred twelve million, five hundred one thousand, three hundred thirty-one".