312028397 has 2 divisors, whose sum is σ = 312028398. Its totient is φ = 312028396.

The previous prime is 312028351. The next prime is 312028399. The reversal of 312028397 is 793820213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311557801 + 470596 = 17651^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 312028397 - 2⁶ = 312028333 is a prime.

Together with 312028399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312028399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156014198 + 156014199.

It is an arithmetic number, because the mean of its divisors is an integer number (156014199).

Almost surely, 2^312028397 is an apocalyptic number.

It is an amenable number.

312028397 is a deficient number, since it is larger than the sum of its proper divisors (1).

312028397 is an equidigital number, since it uses as much as digits as its factorization.

312028397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 312028397 is about 17664.3255461396. The cubic root of 312028397 is about 678.2628649511.

The spelling of 312028397 in words is "three hundred twelve million, twenty-eight thousand, three hundred ninety-seven".