345306491 has 2 divisors, whose sum is σ = 345306492. Its totient is φ = 345306490.

The previous prime is 345306449. The next prime is 345306497. The reversal of 345306491 is 194603543.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 345306491 - 2¹⁸ = 345044347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (345306497) 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, 172653245 + 172653246.

It is an arithmetic number, because the mean of its divisors is an integer number (172653246).

Almost surely, 2^345306491 is an apocalyptic number.

345306491 is a deficient number, since it is larger than the sum of its proper divisors (1).

345306491 is an equidigital number, since it uses as much as digits as its factorization.

345306491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 345306491 is about 18582.4242498120. The cubic root of 345306491 is about 701.5655375893.

The spelling of 345306491 in words is "three hundred forty-five million, three hundred six thousand, four hundred ninety-one".