345256817 has 2 divisors, whose sum is σ = 345256818. Its totient is φ = 345256816.

The previous prime is 345256799. The next prime is 345256823. The reversal of 345256817 is 718652543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320266816 + 24990001 = 17896^2 + 4999^2 .

It is a cyclic number.

It is not a de Polignac number, because 345256817 - 2⁶ = 345256753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (345256217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172628408 + 172628409.

It is an arithmetic number, because the mean of its divisors is an integer number (172628409).

Almost surely, 2^345256817 is an apocalyptic number.

It is an amenable number.

345256817 is a deficient number, since it is larger than the sum of its proper divisors (1).

345256817 is an equidigital number, since it uses as much as digits as its factorization.

345256817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 345256817 is about 18581.0876161758. The cubic root of 345256817 is about 701.5318947835.

The spelling of 345256817 in words is "three hundred forty-five million, two hundred fifty-six thousand, eight hundred seventeen".