312028631 has 2 divisors, whose sum is σ = 312028632. Its totient is φ = 312028630.

The previous prime is 312028579. The next prime is 312028657. The reversal of 312028631 is 136820213.

It is an a-pointer prime, because the next prime (312028657) can be obtained adding 312028631 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312028631 is a prime.

It is a super-2 number, since 2×312028631² = 194723733127468322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312028631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312028681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156014315 + 156014316.

It is an arithmetic number, because the mean of its divisors is an integer number (156014316).

Almost surely, 2^312028631 is an apocalyptic number.

312028631 is a deficient number, since it is larger than the sum of its proper divisors (1).

312028631 is an equidigital number, since it uses as much as digits as its factorization.

312028631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 312028631 is about 17664.3321696576. The cubic root of 312028631 is about 678.2630345013.

Adding to 312028631 its reverse (136820213), we get a palindrome (448848844).

The spelling of 312028631 in words is "three hundred twelve million, twenty-eight thousand, six hundred thirty-one".