345199891 has 2 divisors, whose sum is σ = 345199892. Its totient is φ = 345199890.

The previous prime is 345199873. The next prime is 345199919. The reversal of 345199891 is 198991543.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 345199891 - 2¹¹ = 345197843 is a prime.

It is not a weakly prime, because it can be changed into another prime (345199831) 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, 172599945 + 172599946.

It is an arithmetic number, because the mean of its divisors is an integer number (172599946).

Almost surely, 2^345199891 is an apocalyptic number.

345199891 is a deficient number, since it is larger than the sum of its proper divisors (1).

345199891 is an equidigital number, since it uses as much as digits as its factorization.

345199891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 49.

The square root of 345199891 is about 18579.5557266583. Note that the first 3 decimals coincide. The cubic root of 345199891 is about 701.4933364333.

The spelling of 345199891 in words is "three hundred forty-five million, one hundred ninety-nine thousand, eight hundred ninety-one".